This is a bit of a stretch, but …
Thinking along the lines of ossifragus (bone-breaking), I wonder if maybe you can form a compound adjective. -fragus is weirdly irregular, but there are more regular ways (see section 251). Noting that “-āx denotes a faulty or aggressive tendency,” you could form mentiflectax, -acis. The prefix menti- is derived from mens, mentis with the addition of the popular i infix. Mens itself seems a fine choice, and the alternatives like animus are unwieldy; it is quite a mouthful as it is.
This is an adjective, but you can use it as a standalone word like a noun if you like. (This is comparable, for example, to mendax, “prone to lying,” or “liar.”)
For example: Sumus oppugnati ab hostibus mentiflectacibus = “we were attacked by the mindbending enemies.”
Nihil sub sole novum: there was actually a video game with “Mindbenders” in the title as early as 1988 ;)