Participate in the elimination of the Encrisiter in Grim GablesThis challenge is not very complicated, whether in solo, duo or section, since you do not necessarily need to kill the Encrisiter yourself. The simple fact of inflicting damage on it allows the realization of this quest, provided that the NPC ends up, all the same, by being eliminated.
You will therefore have to go in Grim Gables, which replaces the sawmill, and fight the Encrisiter. If you don't know where he is, look near the Manor and more specifically in the basement, where he is most likely to be. You will then be able to shoot him, but be careful, the character will defend himself. It will therefore be necessary to have ammunition and above all care so as not to die stupidly.
Once the Encrisiter has been eliminated, and having hit it at least once, you will have validated the challenge and can unlock the promised banner.