The Great Olm is the raid boss of Chambers of Xeric: ranged on the head, melee on the south claw, magic on the north claw, and a stack-up teleport you can't ignore. Twisted bow at 1 in 1,210 per chest.
The raid boss of Chambers of Xeric is the Great Olm: a head in the middle of the chamber with a claw on either side. Enter through the raid portal in Edgeville with 100 combat. See Raids for how the reward chest works.
| Part | Hitpoints (solo) | Damage it with |
|---|---|---|
| Head (middle) | 2,400 | Ranged only |
| Left claw (south, nearest the entrance) | 300 | Melee |
| Right claw (north) | 300 | Magic |
The head can't be hurt while either claw is alive, so kill both claws first. A claw hit with the wrong style takes only a third of the damage, and the claws never attack. When the head falls to two thirds and then one third of its health, both claws come back at full health and the head is protected again. A single melee hit of 15 or more makes the left claw clench shut for about 5 seconds.
Olm attacks about every 5 seconds with magic (up to 27) or ranged crystals (up to 29). It starts on magic and sometimes switches, and the matching protection prayer blocks each attack completely. Between attacks it cycles through these:
| Attack | What to do |
|---|---|
| Crystal bomb | Marks every player's tile; move 2 tiles away within 3 seconds |
| Lightning | Two rows of strikes; stay off the marked tiles |
| Teleport | Olm names a player: everyone stack on them |
| Healing pools | Stand in them, or each one heals the head 12 a tick |
In the final phase crystals fall on every player every 3 seconds, so keep moving. Floor attacks like these ignore prayer and can kill you. A full Justiciar set or an Elysian spirit shield reduces them.
Each chest has a 1 in 20 chance of a unique. The chances below are per chest:
| Unique | Chance per chest |
|---|---|
| Dexterous prayer scroll | 1/121 |
| Arcane prayer scroll | 1/121 |
| Twisted buckler | 1/202 |
| Dragon hunter crossbow | 1/202 |
| Dinh's bulwark | 1/242 |
| Ancestral hat | 1/269 |
| Ancestral robe top | 1/303 |
| Ancestral robe bottom | 1/303 |
| Dragon claws | 1/303 |
| Elder maul | 1/346 |
| Kodai insignia | 1/484 |
| Twisted bow | 1/1,210 |
| Olmlet (pet, separate roll) | 1/400 |
The prayer scrolls permanently unlock Rigour (Prayer 74) or Augury (Prayer 77) and give 250,000 Prayer XP, multiplied by your game mode's rate. The Twisted bow hits harder the higher its target's Attack level, up to about 2.5 times its normal max hit against Olm's head and Verzik.
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