To complete the "Defeat a Unique Map Boss that is Possessed while in a Ritual" PoE 3.28 challenge (part of the Cross Contamination set), you must ensure the boss is both possessed by a Tormented Spirit and within an active Ritual encounter at the moment of death.
Preparation
- Use a Tormented Scarab (Area is haunted by 4 additional Tormented Spirits) to ensure ghosts are present,
- or Choose map with mods: Unique Bosses are Possessed

List of Ritual Scarabs
| Name | Description | Stack |
|---|---|---|
| Ritual Scarab of Selectiveness | Rerolling Favours at Ritual Altars in Area has no cost the first 2 times Ritual Altars in Area allow rerolling Favours 2 additional times | Stack Size: 1 / 20 Limit: 2 |
| Ritual Scarab of Wisps | Ritual Altars in Area spawn a Wildwood Wisp Wildwood Wisps grant 100% increased Tribute Gained to nearby Players | Stack Size: 1 / 20 Limit: 1 |
| Ritual Scarab of Abundance | Rituals in Area offer 100% increased Favours | Stack Size: 1 / 20 Limit: 2 |
| Ritual Scarab of Corpses | Rituals in Area contain an additional Rare Itemised Corpse Monster | Stack Size: 1 / 20 Limit: 2 |
The Process
- Locate a Ritual altar near the boss room.
- Lure the boss into the Ritual circle and kill it.
- Activate the Ritual, which will cause the boss to respawn within it.
- Ensure the boss becomes possessed by a Tormented Spirit (often happens naturally if the boss is possessed or if using Tormented mechanics).
- Kill the possessed boss while the Ritual is active.