Talk:Caves/@comment-69.242.135.251-20130824163147/@comment-20738717-20130920145339

If WX-78 dies in a cave, he does lose his stats. This is a known bug, posted on Klei's website forum.

The developer has stated that fixing this is a low priority because deaths in caves will soon work just like deaths on the surface. At that point you need a touchstone, meat effigy, etc to avoid cave deaths, then WX-78 will keep his upgrades.

Until fixed I wouldn't take an upgraded WX-78 into a cave.