The sphere that holds each artifact in the Artifact Trials. It only takes damage from keys.

| Type | Special boss |
| Health | 100,000 (+30,000 per level) |
| Base damage | 10 (+2 per level) |
| Armour | 100,000 |
| Where it spawns | Only in Bulwark's Ambry, after entering an artifact code. |
Fires lasers around itself that chase you; the less health it has, the faster.
How to dodge it: Do not stay near the sphere longer than it takes to turn in a key.
That trial's artifact, and a portal that sends you back to stage 1.
That trial's artifact, and a portal that sends you back to stage 1.
Only in Bulwark's Ambry, after entering an artifact code.
100,000 base health, plus 30,000 per enemy level. Armour: 100,000.
Sources: the Risk of Rain 2 wiki (each boss page and Module:Enemies/Data, read on 31 October 2026) and the game's own text. The explanations are our own. Icons: Risk of Rain 2 (Hopoo Games / Gearbox).