Great Olm
Weak to earth +50%
Best in slot
The best setup using every item in the game, at 99s with potions and the best prayer.
Ranged
Best here
Twisted bow · Seeking dragon arrow
Magic
Tumeken's shadow · Holy blessing
Melee
Scythe of vitur · Holy blessing
Other options by slot
The best ranged pick for each slot and the next best options. Each percentage is the DPS you lose by swapping in just that item against Great Olm.
Mechanics
Olm has at least four phases, plus one for every 8 players, and you only move on once both hands are down.
The head takes 66% less from anything but ranged and heals if you hit it before the last phase. The right hand takes 66% less from non-magic, the left from non-melee. Prayer cuts his normal attacks by about 75-80%, and the right prayer blocks the spheres completely (red melee, green missiles, purple magic). North-south lightning turns your prayer off and binds you. Crystal seedlings spawn under everyone, falling crystals hit 16-25, and on the second-to-last phase the left hand heals from your damage.
Which style: Ranged on the head, magic on the right hand, melee on the left. Everything else is cut by 66%, and the head takes 50% extra from earth spells.
From the OSRS Wiki, CC BY-NC-SA 3.0.
Inventory
The OSRS Wiki's own “Max” setup for the Chambers of Xeric, slot for slot.
Twisted bow
Ranged weapon to swap to
Necklace of rupture
Ranged gear to swap into
Tumeken's shadow
Magic weapon to swap to
Occult necklace
Magic gear to swap into
Masori body (f)
Ranged gear to swap into
Masori chaps (f)
Ranged gear to swap into
Ancestral robe top
Magic gear to swap into
Ancestral robe bottom
Magic gear to swap into
Zaryte vambraces
Ranged gear to swap into
Blessed Dizana's quiver
Ranged gear to swap into
Confliction gauntlets
Magic gear to swap into
Imbued Saradomin cape
Magic gear to swap into
Masori mask (f)
Ranged gear to swap into
Toxic blowpipe
Its special attack heals you by half the damage it deals
Ancestral hat
Magic gear to swap into
Voidwaker
Its special attack always hits, for 50-150% of your melee max
Saradomin brew(4)×3
Heals past your maximum, but lowers your attack stats
Anglerfish
Heals up to 22, and can take you past your maximum
Sanfew serum(4)
Restores prayer and stats, and holds poison off
Super combat potion(4)
Boosts Attack, Strength and Defence
Super restore(4)
Restores prayer and any stats that have been lowered
Ranging potion(4)
Boosts Ranged
Scythe of Vitur
Melee weapon to swap to
Bandos godsword
Its special attack lowers Defence by the damage it deals
Book of the Dead
Lets you raise thralls: resurrection spells need it worn or in your inventory
Divine rune pouch
Holds the runes for your spells in one slotThe wiki's own setups
Equipment and inventory as the OSRS Wiki's strategy page lists them for the Chambers of Xeric, slot for slot. These are what people actually take; the solved kits above are what the maths prefers. The inventory drawn above is the one with the “Max” gear, so that card shows only its equipment.
Minimum
Standard
Bowfa
Max
What it defends with
Combat tasks
3 tasks worth 15 points. And 23 more for the whole raid. And 1 for the Crystal Crabs room. Open the planner to track the ones you have done.
Master
3 tasks
5 points eachWhole raid
23 tasks 120 points
Elite
3 tasks
4 points eachMaster
12 tasks
5 points each
Grandmaster
8 tasks
6 points eachCrystal Crabs room
1 task 5 pointsMaster
1 task
5 points each