Larian Studios Forums Divinity: Original Sin 2 - The Modding Dungeon Divinity - Original Sin 2 - Projects In Progress D&D Inspired Skill Mod

To do Time Stop properly would probably require more scripting than I'm willing to do, but a skill like Time Warp could be tweaked to give something of the same flavor, with albeit different mechanics.

There might be other ways too, I'll have to brainstorm that one a bit.