Kannzo

As the Title says Im currently stuck in a Excavation mission( a void mission to be exact) and the prompt for me to leave hasnt shown up yet I already went trough 4 or 5 relics and I have lots of loot but I want to leave I read that I have to get an excavator to 100% but that is impossible since no enemies with power cells are spawning. also ive been playing for so long that I can only kill enemies when im out of their range someone please help me