I've encountered a conditionally game-breaking bug, albeit not in the real gameplay. Whenever a bot in local multiplayer goes to convert the soul of a dead neutral enemy while they're fighting alone against another bot, it paces back and forth as if to ask the true meaning of all this war and death and repurposing of innocent souls for things they were never meant for. I really like to surrender right in the middle of a 1v1v1 with local bots, and then use the Observe mode to watch the bots go at it, and they're in the Gladiator map with no starting souls as well as no souls in the map - with the only way to gain any souls by attacking the map enemies with Lv. 1 damage spells and then converting. With the latter being stopped by broken AI patterns, there is really nowhere to go from here :P

This isn't a question because the bug is nowhere near major enough for this to be one (I'd be a little silly to do something the developers never meant you to and then complain about a game-breaking bug)but it's still something that really shouldn't be happening.