Tomb of Osiris

A raid featuring three progressive difficulties (plus an Elite tier), exclusive rewards, and Osirian equipment.

Unlock progression

An Osiris Letter was added to the Grand Priest Kharos drop table (1/100, untradeable). Unlock each difficulty with: source

Easy/Medium/Hard requirements per the launch post; Elite requirement per the Elite Osirian Tomb update.

Mechanics

• Supports 1–3 players.
• Boss HP scales by 50% for each additional team member.
• Every difficulty awards its own Osirian Raid Key (Easy/Medium/Hard Osirian Key).
• Teams share a life pool of 4 lives per player (Solo: 4, Duo: 8, Trio: 12) — exceeding it fails the raid and returns all players home.

All difficulties feature the same four bosses and mechanics, scaling in difficulty:

• Aurexis — Magic attacks (Protect from Magic reduces damage 90%). Every 4th attack creates safe sand tiles around the arena — stand on one or take heavy scaling damage. Every 6th attack summons an Osiris Guardian (100M HP); up to two can be active and must be defeated before Aurexis can be damaged again.
• Zarethis — Magic attacks (Protect from Magic reduces damage 90%). Every 4th attack releases a homing shadow flame that pursues its target. Every 6th attack summons an Osiris Guardian (100M HP), same as above.
• Kheprion — Ranged attacks (Protect from Missiles reduces damage 90%). Every 4th attack strikes a 4×4 area with thorny vines that drain health while stood in. Every 6th attack summons an Osiris Guardian (100M HP), same as above.
• Sobekhar — Melee attacks (Protect from Melee reduces damage 90%). Every 4th attack performs one random special attack from the previous three bosses, and can leap into the air to slam the arena, creating craters. Performs two Guardian phases, each summoning 2 Osiris Guardians (100M HP each).

source. Osiris Guardian HP already divided by 10 for the August 29, 2026 Damage & HP Scaling Update (published as 1B HP).

Boss HP by difficulty

Easy/Medium/Hard HP per the launch post; Elite HP per the Elite Osirian Tomb update. All values already divided by 10 for the August 29, 2026 Damage & HP Scaling Update (published as 4.5B-8B).

Rewards by difficulty

Easy — Common: 100M Avernic Taxbags, 1M Mob Tickets, 25 OP PvM Boxes, Silver/Gold/Diamond Casket, $5/$10/$25/$50 Bond. Rare: Eternal Casket 1/750, Apex Casket 1/1,000, Osirian Gloves 1/1,000, Osirian Boots 1/1,000, Tomb Raid Pet 1/2,000.

Medium — Common: 150M Avernic Taxbags, 1.5M Mob Tickets, 35 OP PvM Boxes, Silver/Gold Casket, $5/$10/$25/$50 Bond. Rare: Eternal Casket 1/750, Apex Casket 1/1,000, Osirian Gloves/Boots 1/750, Osirian Helm/Platebody/Platelegs 1/1,000, Tomb Raid Pet 1/1,750.

Hard — Common: 200M Avernic Taxbags, 2M Mob Tickets, 50 OP PvM Boxes, Silver/Gold/Diamond Casket, $5/$10/$25/$50/$100 Bond. Rare: Eternal Casket 1/750, Apex Casket 1/1,000, Osirian Gloves/Boots 1/500, Osirian Helm/Platebody/Platelegs 1/750, Osirian Shard 1/1,000, Tomb Raid Pet 1/1,500.

Elite — Common: 250M Avernic Taxbags, 2.5M Mob Tickets, 70 OP PvM Boxes, Silver/Gold/Diamond Casket, $5/$10/$25/$50/$100 Bond. Rare: Eternal Casket 1/500, Apex Casket 1/750, Osirian Gloves/Boots/Helm/Platebody/Platelegs 1/500, Osirian Shard 1/750, Osirian Weapons 1/1,000, Tomb Raid Pet 1/1,000. Elite also introduces the Osirian Greataxe, Osirian Bow and Osirian Staff (+110,000 to their respective combat style) source.

Achievements & collection log

A shared Collection Log spans Easy, Medium and Hard difficulties — completing it (collecting every unique raid drop) rewards a Hydrix Casket. source

Notes

• Each completion also awards 1 ToS Point, spent at the Raids Master Shop — the source post calls this raid "Tombs of Osiris" throughout that section. source

Related

Grand Priest Kharos, Solaris Gear, Raids Master Shop

Source: official patch notes at avernicrsps.com/updates.