Rex Matriarchs — Osseous Overview
General Information
⬥ Osseous has 350,000 LP, across a single fight phase.
⬥ Osseous is immune to Ranged, Melee and Magic damage.
Other guides: Rex Matriarchs guides AFK Osseous
Gear, Relics and Familiars
Fight Mechanics
Avoid using Darkness darkness at Osseous as it will often negate your defensive abilities, for example using res on a big hit to heal you may not work.
Attack Rotation
2x auto → 1x range → 1x auto → Minion Summon →
3x auto → 1x Minion Launch → 2x auto > Osseous’ Roar →
2x auto → Munch > 1x auto →
Repeat
Auto Attacks
Mechanic: Osseous attacks primarily with Necromancy damage, with some Ranged attacks.
Solution:
⬥ If camping prayers, use a Necromancy protection prayer (deflectnecromancy / protectfromnecro)
⬥ Pray soulsplit once you are comfortable surviving mechanics
Minion Summon (Example)Source video
Mechanic: Osseous slams the ground, dealing heavy melee damage and summoning baby skeletons that can heal her.
Solution:
⬥ Use res to heal from the melee hit
⬥ If Resonance is unavailable, pray protectfrommelee or deflectmelee and use devo
⬥ Alternatively, reflect can be used to reduce damage
⬥ Ignore the skeletons initially and prepare for the next mechanic
Minion Launch (Example)Source video
Mechanic: Osseous throws minions at you, stunning you and spawning additional skeletons.
Solution:
⬥ Stay targeted on Osseous
⬥ Clear the skeletons using any of these approaches:
• threadsoffate → volleyofsouls / fingerofdeath
• commandzombie (after the stun)
• Three casts of spectralscythe
⬥ Target and kill any remaining skeletons to prevent explosion damage
Osseous’ Roar (Example)Source video
Mechanic: You are pulled into melee distance and bound in place.
Solution:
⬥ Ensure all skeletons are cleared before this mechanic
⬥ Prepare defensives if damage overlaps with other mechanics
Munch (Example)Source video
Mechanic: Osseous binds you and prepares a high-damage bite attack.
Solution:
⬥ Deal damage to fill the bar above Osseous
⬥ Use any damage-negating defensive, like res, disrupt or divert to completely block
Helpful videos
Attribution and source history
Adapted from Osseous Basic by PvME contributors. Upstream source history. Licensed CC BY-NC-SA 4.0. Snapshot 074a9438f79d10fba75735791be0030734db8b5e. Formatting adapted for standalone MediaWiki; media and third-party references remain external links.