Was going through Craigholdt and got my hands on a Widowmaker Figurine that summon the large Widowmaker and its 2 smaller version. While doing a quest in the very first floor, I was fighting some floating weapons, and decided I needed backup. Finished the battle and continued on my way, until I noticed 1 extra party member along with me. The Large Widowmaker is now a permanent pet, can stealth and everything.
I attempted to summon it again by using the 2nd one I acquired, but it disappeared after the battle ended.
Just giving a heads up on the bug. And sorry if I did the title or format of this wrong, first post!