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Algalon the Observer - Ulduar boss guide

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Tactics for Algalon Observer 10/25 for WoW 3.3.5a: Quantum and Phase strikes, Heavenly Punishment, Collapsing stars and Black holes, Big Bang, Living constellations and a hard 6-minute enrage, full of loot. The hidden final boss and the only "hardmode" of Ulduar.

Ulduar
10N10HC25N25HC
⏱ Berserker: After ~6 minutes of battle, Algalon casts Ascension to the Heavens (655,500–724,500 Arcane damage) - guaranteed wipe. Separately: Algalon himself disappears 1 hour after the first entry into this location.

Review

Algalon the Observer is an envoy of the Titans who arrived to assess the corruption of Azeroth and, if necessary, transmit the Omega code to refound the planet (erasing all life). The hidden and reputedly true final boss of Ulduar. Unlocks only after a long chain: kill Yogg-Saron and complete the hardmods of Hodir, Thorim, Freya, Mimiron for their sigils and the Celestial Observatory Key. Algalon himself does not have a normal mode - the entire battle is hardmode. Plus there is a hard limit: after the first login, Algalon disappears after 1 hour of real time (per lock per week), so there are few attempts. Mechanically, it's two acts of tank-kill: Algalon hits the tank monstrously hard and fast (Quantum + Phase Strikes) while the raid juggles Collapsing Stars, Black Holes and Big Bang. In 6 minutes - guaranteed wipe by Ascension to Heaven.

10 Normal8 367 000
10 Heroicthe entire battle is hardmode, there is no separate normal
General tips
  • Access is paid for time: a chain of quests (Yogg-Saron + hardmods of Hodir/Torim/Freyya/Mimiron), and after the first pool - only 1 hour for attempts for a lock. Shoot quickly and smoothly.
  • Tanks are the main consumable. Algalon hits very painfully and often (Quantum Strike 15,675–17,325 on target every ~3 sec). Heals pour into the tank non-stop, debuffs are always on the boss, rotation of defensive CDs is mandatory.
  • Phase Strike stacks; at 5 stacks the tank falls out of phase for ~10 seconds, and Algalon is free. Tank swap at 4 stacks - in advance, with CD and warning of heals.
  • Heavenly punishment drops meteors (1 target at 10, 3 at 25) - get out of the red circles and stay away even from strangers (there is a splash based on distance). Stretch.
  • Collapsing stars lose 1% HP/sec and upon death hit with a Black Hole Explosion (~16k darkness in the raid) + leave a Black Hole. Kill them ONE AT A TIME on command, otherwise the synchronized explosion will wipe the raid.
  • A big explosion (every ~90 sec) ignores immunities (Divine Shield, Ice Block) and one-shots - when it is cast, EVERYONE dives into the Black Hole. But at least one player must remain in the hall, otherwise Algalon will immediately wipe with Ascension. Usually the tank remains (entering the hole resets the threat).
  • Living constellations (adds) hit the top threat (often heals) with Arcane Barrage. The second tank holds them and leads them into Black Holes - when they touch, the constellation and the hole disappear.
  • Phase 2 (with 20%) - race. Stars and constellations no longer appear, instead, Liberated Dark Matter emerges from 4 Black Holes every 30 seconds - a free tank collects them, the raid finishes off Algalon.

Combat phases

Phase 1 Phase 1 - 100%–20% Algalon Pool

The hall turns into space. Algalon bites into the tankQuantum Strike and every ~15 seconds hangsPhase Strike (tank swap at 4 stacks). PeriodicallyHeavenly punishment drops meteors on random targets. Every ~60 seconds 4 Collapsing Stars will spawn - they are killed one by one (the Black Hole Explosion hits the raid), leaving Black Holes. Once every ~50 seconds, 3 Living constellations arrive - they are kited into Black Holes. Every ~90 sec —Big Bang: everyone dives into the Black Hole (one remains in the hall). Lasts up to 20% HP.

  • Tank swap byPhase Strike (4 stacks)
  • Kill the Collapsing Stars one at a time
  • Kite Living Constellations into Black Holes
  • Dive into the Black Hole onBig Bang
  • Leave fromHeavenly punishment
Phase 2 Phase 2 – 20%–0% Algalon for 20% HP

Collapsing stars and Living constellations disappear and no longer spawn, old Black Holes disappear. Algalon opens 4 Black Holes, from each one comes out every 30 secondsUnleashed dark matter(weak adds). A free tank gathers all four and pulls them towards the boss under AoE. Quantum Strike, Phase Strike (tank swap),Heavenly punishment andBig Bang continue. Pure DPS race to ~1–2%, where Algalon gives up.

  • Free tank collects Dark Matter
  • Tank swap byPhase Strike continues
  • Dive onBig Bang
  • Burst Algalon to Enrage

Abilities

Quantum Strike
Tank F.1
Every ~3 sec on the current target: 15,675–17,325 physical damage. Plus, quick auto attacks are the main source of tank deaths.
Action: Heels keep the tank in the top continuously. Algalon is one of the hardest hitting bosses in all of WotLK; Without dense healing and protective CDs, the tank cannot survive.
Phase Strike
Tank F.1
Once every ~15 sec on the target: 8,788–10,212 damage + stack of debuff. At 5 stacks, the target falls into another phase for ~10 sec, and Algalon is free (switches to the second most dangerous).
Action: Tank swap at 4 stacks - in advance, so that the boss doesn’t break down. The swapping tank keeps its CD ready, the healers shift their focus synchronously with the taunt.
Heavenly punishment
Raid damage F.1
Every ~25 sec: meteors on random players (1 target at 10, 3 at 25). Red circle, after ~4 seconds a fire strike (one-shot at the epicenter + splash at a distance).
Action: Leave the red circle and stay away even from other people's circles - the damage of the splash depends on the distance. Spread out across the room so you don't all have to move at once.
Black hole explosion
add F.1
Phase 1: 4 stars every ~60 sec. Lose 1% HP/sec; on death - Black Hole Explosion (16,088–16,912 darkness throughout the raid) and leave a Black Hole.
Action: The designated range kills the stars ONE AT A TIME, waiting for the healers to raise the raid after each explosion. Letting all four die at the same time = synchronized explosion and wipe. Black holes from them are needed for the Big Bang and constellations.
Arcane Barrage
add F.1
Phase 1: 3 constellations every ~50 sec. They hit the top threat (often heals) with Arcane barrage. They are killed instantly when touching the Black Hole (the constellation and the hole disappear).
Action: A free tank picks up a threat in the constellations and leads them into Black Holes (DKs are ideal - Death Grip). Be careful not to climb into the hole yourself - the constellations will fall back onto the healers.
Harsh Strike
Raid damage F.1
Every ~90 sec, cast 8 sec: 76,313–88,687 physical damage to nearby ones - one-shot. Ignores immunities (Divine Shield, Ice Block); You can only escape by going into the Black Hole.
Action: At casting, EVERYONE dives into the Black Hole (within ~1500 darkness/sec and Dark Matter adds - survive). But someone must stay in the hall, otherwise Algalon will wipe with Ascension. Usually the tank remains (entering the hole resets the threat) and survives the explosion with protective CDs; a shadow priest with Dispersion is a classic "soaker".
Summon Unleashed Dark Matter
add F.2
Phase 2: an add emerges from each of the 4 Black Holes every 30 sec. They hit weakly, there are no real abilities.
Action: A free (not tanking Algalon) tank gathers all four and keeps it with the boss to finish off the AoE. Don't let them accumulate - the rest of the raid is pressing on Algalon.
Ascension to Heaven
Berserk F.1
Enrage: After ~6 minutes of combat (or if no one is left in the room during the Big Bang), Algalon ascends and deals 655,500–724,500 Arcane damage to everyone - a guaranteed wipe.
Action: The battle should take ~6 minutes - this is a tough DPS check (for 10 ~ 24k raid DPS, for 25 ~ 101k). Always leave someone in the room for the Big Bang.

Positioning

Algalon in the center (there is no frontal cone - you can place it as convenient). Range and heals are spread out as much as possible around the hall under the Heavenly Punishment, ideally one at a time. The miles are either in a bunch or in a couple of groups - also near the Karoo. Black holes from killed stars are kept at the edges as “shelters” for the Big Bang and for the formation of constellations.

🛡 Tank
Minimum two tanks: the main one on Algalon (swap tank with 4 stacks of Phase Strike), the second kites Living Constellations into Black Holes (phase 1) and collects Dark Matter (phase 2). Both keep defensive CDs on rotation - Quantum Strike and auto attacks kill quickly. During the Big Bang, the tank remains in the hall and survives the cooldown.
✨ Healer
Tank healing is priority number one: we pour non-stop. The fight is extremely mana-intensive - take regen gear. Stretch one by one under the Heavenly Punishment. Disciplinary Priest + Light of the Paladin is the best combination for a tank. Coordinate the switch to the swapping tank.
⚔DD
The assigned range kills the Collapsing Stars strictly one at a time. Don't hit AoE stars/constellations at the wrong time. Move minimally, match targets clearly. Phase 2 - maximum burst on Algalon for a 6-minute enrage.

Role Tips

🛡 Tips for the tank
  • Tank swap on 4 stacksPhase Strike - don’t wait for the 5th, otherwise the boss will lose his temper for 10 seconds.
  • Quantum Strike + auto attacks kill quickly: keep defensive CDs in rotation, ask for external ones.
  • OnBig Bang stay in the hall (entering the hole resets the threat) and survive the cooldown.
  • Second tank: phase 1 - kite constellations into Black Holes, phase 2 - collect Dark Matter.
✨ Tips for healer
  • Lay at the tank continuously - this is the hardest hitting boss in WotLK.
  • The fight eats up mana: regen-gear, potions, planning CD for peaks (explosions of stars).
  • Stand alone underHeavenly punishment, do not treat from the red circle.
  • Synchronize switching with tank swap so that treatment is not late.
⚔ DD Tips
  • Collapsed stars - strictly one at a time, waiting for the raid to be raised by healers.
  • Don't hit stars and constellations with AoE/blades at the wrong time - synchronized explosion = wipe.
  • OnBig Bang dive into the Black Hole, dodge the Dark Matter inside.
  • Phase 2 - all burst in Algalon; A 6-minute enrage is a tough DPS check.
  • Stretch underHeavenly punishment, move minimally, don’t be greedy with your position.

Loot

SlotItemClassesNote
Neck Grim Witness Pendant PriestMageWarlockShamanDruidPaladin 10, ilvl 239. Neck heal/caster: 61 stamina, 52 int, crit, 21 mp5, 75 SP, red socket.
Neck Heavenly powers WarriorPaladinDeath Knight 10, ilvl 239. Neck physical dps: 75 strength, 81 stamina, crit, haste, yellow socket.
Shoulders Observer's Robe Shaman 10, ilvl 239. Chainmail, heal/caster: 68 stamina, 69 int, crit, haste, 114 SP, 2 sockets.
Shoulders Observatory Shoulderguards WarriorDeath Knight 10, ilvl 239. Armor, physical dps: 93 strength, 109 stamina, crit, AP, yellow + red sockets.
Back Messenger's Drape PriestMageWarlockShamanDruidPaladin 10, ilvl 239. Cloak, heal/caster: 51 stamina, 41 int, crit, accuracy, 83 SP, yellow socket.
Chest Breastplate of Timelessness WarriorPaladinDeath Knight 10, ilvl 239. Plate, tank: 92 strength, 167 stamina, defense/parry/mastery, 2 blue sockets.
Hands Pulse Gloves PriestMageWarlock 10, ilvl 239. Fabric, DPS caster: 86 stamina, 54 int, accuracy, haste, 114 SP, 2 red sockets.
Hands Gloves of Endless Darkness RogueDruid 10, ilvl 239. Skin, physical dps: 96 agility, 57 stamina, accuracy, haste, 95 AP, 2 sockets.
Belt Starfall Girdle WarriorPaladinDeath Knight 10, ilvl 239. Plate, physical dps: 93 strength, 109 stamina, crit, skill, 2 sockets.
Legs Zodiac Leggings Druid 10, ilvl 239. Leather, heal/caster: 96 stamina, 79 int, 75 spirit, haste, 150 SP, 2 sockets.
Feet Starlight Treads PriestMageWarlock 10, ilvl 239. Fabric, heal/caster: 73 stamina, 74 int, 51 spirit, crit, 107 SP, 2 sockets.
Ring Nebula Ring PriestMageWarlockShamanDruidPaladin 10, ilvl 239. Heal/caster ring: 55 stamina, 41 int, crit, haste, 83 SP, yellow socket.
Ring Ring of Lights RogueHunterShamanDruid 10, ilvl 239. Ring of physical dps: 64 agility, 44 stamina, accuracy, 111 AP, AP, red socket.
Accessory Dark Essence WarriorRogueHunterShamanDeath KnightDruidPaladin 10, ilvl 239. Physical dps trinket: 251 AP + proc 692 crit for 10 sec (15%, CD 45 sec).
Accessory Meteorite Crystal PriestMageWarlockShamanDruidPaladin 10, ilvl 239. Cast/heal trinket: 125 int + use (for each cast in 20 sec, a stack of replenishment of 85 mana/5 sec).
Head Burning Gaze HunterShaman 25, ilvl 252. Chain mail, physical dps: 79 agility, 114 stamina, 77 int, crit, accuracy, 255 AP, meta + blue sockets.
Wrists Solar handcuffs RogueDruid 25, ilvl 252. Skin, physical dps: 73 agility, 70 stamina, haste, 97 AP, skill, yellow socket.
Hands Pharos Gloves PriestMageWarlock 25, ilvl 252. Fabric, heal/caster: 83 stamina, 83 int, crit, haste, 105 SP, 2 sockets.
Belt Stargazer's Girdle PriestMageWarlock 25, ilvl 252. Fabric, heal/caster: 93 stamina, 78 int, 73 spirit, crit, 105 SP, 2 yellow sockets.
Belt Star coverage Druid 25, ilvl 252. Leather, heal/caster: 93 stamina, 78 int, 55 spirit, haste, 105 SP, 2 sockets.
Legs Legplates of the Bottomless Abyss WarriorPaladinDeath Knight 25, ilvl 252. Plate, tank: 146 strength, 178 stamina, defense/evasion/parry, 3 sockets.
Feet Field boots Shaman 25, ilvl 252. Chain mail, heal/caster: 93 stamina, 78 int, crit, 32 mp5, 105 SP, 2 sockets.
Feet Shoes of the Impenetrable Night WarriorPaladinDeath Knight 25, ilvl 252. Plate, physical dps: 106 strength, 123 stamina, crit, haste, 2 sockets.
Accessory Comet tail WarriorRogueHunterShamanDeath KnightDruidPaladin 25, ilvl 252. Physical dps trinket: 271 AP + proc 819 speed for 10 sec (15%, CD 45 sec).
Weapons Star Shard PriestMageWarlockShamanDruidPaladin 25, ilvl 252. One-handed dagger, heal/caster: 45 stamina, 62 int, 49 spirit, accuracy, 665 SP, 970 AP in beast form, blue socket.
Weapons Star Weave PriestMageWarlockShamanDruidPaladin 25, ilvl 252. One-handed crushing weapon, heal/caster: 61 stamina, 62 int, crit, 27 mp5, 665 SP, 970 AP in beast form, blue socket.
Weapons Fang of Oblivion RogueDruid 25, ilvl 252. One-handed dagger 1.80: 53 agility, 61 stamina, crit, haste, 91 AP, 2133 AP in beast form, yellow socket.
Weapons Sleepy spindle DruidHunter 25, ilvl 252. Staff, physical dps/ferial: 128 agility, 120 stamina, haste, 160 AP, AP, 3001 AP in beast form, 2 sockets.
Left hand Space PriestMageWarlockShamanDruidPaladin 25, ilvl 252. Tome (left hand), heal/caster: 59 stamina, 62 int, crit, accuracy, 95 SP.
Left hand Bastion of Alganon WarriorPaladin 25, ilvl 252. Shield, tank: 8563 armor, 238 block, 80 strength, 109 stamina, blocking/defense/evasion, blue socket.
Ranged Skyforged Crossbow Hunter 25, ilvl 252. Crossbow 2.80: 45 agility, 45 stamina, crit, accuracy, 65 AP.
Accessory Shard of Val'anyr PaladinPriestShamanDruid 25. Legendary Fragment: 30 shards = Val'anyr, Hammer of Ancient Kings.