The Crucible Knight from Elden Ring can appear in Nightreign as an Evergaol boss. This heavy-armored enemy is slow but has notable poise, and players will have difficulty breaking their stance and stopping their combos.
When their HP falls below half, the Crucible Knight will enter their second phase and call upon Crucible Incantations. These can catch players off guard, so keep an eye out for audio and visual cues. The Tail incantation is especially deadly, as the Crucible Knight will perform one or two 360-degree tail spins covering a great distance.
Consider fighting Crubile Knight at level 5.