Heavenly Silkworm Potato
Now if they kill him, he won't die. But when has he ever been that close to death? At worst he has just gotten extremely bloodied and weakened.
But that's not the only use of yuan spirit With it, he could create yuan spirit weapon which are capable of doing great damage to others directly. Of course he's already created one before but that one's too static hence not having much use case, this one with yuan spirit should grant him more flexibility