Chris's execute threshold only applies to regular enemies (not bosses), which I initially set to 30% but it seemed rather weak and not worth the upgrade, so I tuned it up. I prefer buffs over nerfs in singleplayer games, so we'll see how this upgrade performs.
The debuff resist is an attempt to make cheesing bosses a little bit harder since I've given the players a lot of new tools to do just that (in addition to the already existing ones). Hopefully it's not too overtuned, so I'll just have to gauge that based on the feedback I get afterwards.