I'm thinking about how to optimize polymorphing a tough enemy, to increase the odds of a successful Plane Shift (the Abyss) afterwards. Here's the criteria I have in mind:
- Low Cha save.
- Low threat (non-deadly or powerful—say, CR≤2)
- Easy to find/difficult for it to hide (so, the bigger, the better; no tiny creatures).
- No flying speed or speed >30 (so it can't flee easily; the slower the better).
- No easy way of escaping/hiding.
Originally, I thought Sea Horse, but wasn't sure if they would suffocate/die and polymorph back, so, any thoughts on that aspect would be welcome too.
The thought is for Polymorph to serve as insurance against the double-whammy of approaching and staying in melee range of a creature who you just failed to send to the Abyss.