Zloth
I smell a... wumpus!?
Big mod with big changes to combat. Some of you folks that didn't enjoy combat that much may like it. Levelling sounds interesting - I don't quite follow from the article exactly how advancement works now but it sounds more Elder Scrolls like where you advance in what you do.
http://www.pcgamer.com/the-witcher-3-enhanced-edition-mod-completely-overhauls-combat-and-alchemy/
http://www.pcgamer.com/the-witcher-3-enhanced-edition-mod-completely-overhauls-combat-and-alchemy/