The spider fang relic is so dumb

How can they think this was a good idea. It is 100% luck based and impossible on solo. Ur on round 40. U need the wisp to spawn which could be in the middle of the round with 50 zombies on you. Do u have aether shroud? Nope not ready yet . Ok let's go try anyways. Ok let's go find Oscar. Where is he? Let's search the entire map. Is ur wisp still active? Ok now go KNIFE the tankiest elite in the game until he dies. Wait, ur wisp left and attacked other zombies so its not on Oscar anymore? The whole round of zombies r still attacking u? Tuff shit. I have zero idea how this is a skill based challenge.