Nonlethal damage doesn't exist in 5e as you can always choose to deal nonlethal damage with weapons now. So rather than refer to a non-existent damage type that might confuse players who never played past editions, I decided to try to find some easier way of showing it. I had considered an exhaustion effect, but decided it would be too brutally punishing as exhaustion is pretty nasty this edition.<br/><br/>And yeah, we're agreed on the sizes thing. I'm generally all for anything my players want to try as long as it seems remotely possible and would be fun. Fun is supposed to be the point of the game after all!<br/><br/>As for the climbing out of smaller predators, I imagine getting into the right position to accomplish this would be pretty difficult. You could use the section of the struggle action where rolling a natural 20 results in the predator releasing you to represent this. It would even make sense that you are straight-up ejected rather than returning simply to ingested in that case.<br/><br/>I'm trying to understand the action flow of a 20th level fighter using those feats, so I'm going to note it out below as I understand it. Correct me if I am wrong!<br/><br/>Chomp would look like this:<br/><br/>Bite (Attack 1), Ingest (Bonus Action), Swallow (Attack 2), Grapple (Attack 3), Ingest (Attack 4)<br/>Action Surge!<br/>Swallow (Attack 1), Grapple (Attack 2), Ingest (Attack 3), Swallow (Attack 4)<br/><br/>This results in (assuming no failed checks and adequate stomach capacity) three eaten creatures twice per short rest as a level 20 character.<br/><br/>Using Backbiter and assuming all creatures are unaware results in the following:<br/>Grapple + Ingest (Attack 1), Swallow (Bonus Action), Grapple (Attack 2), Ingest (Attack 3), Swallow (Attack 4)<br/>Action Surge!<br/>Grapple (Attack 1), Ingest (Attack 2), Swallow (Attack 3), Grapple (Attack 4)<br/><br/>This results in (assuming no failed checks and adequate stomach capacity) three eaten creatures twice per short rest as a level 20 character.<br/><br/>The two feats actually don't work together very well at all as Backbiter allows you to use a bonus action as part of a grapple and Chomp allows you to use a bonus action as part of a bite attack. Action surge or not, you're still limited to one bonus action a turn anyways and most of Backbiter's benefits only work if you use the bonus action granted by the feat, already limiting it to once a turn.<br/><br/>It's fine! It's a big document and it did need to be clarified a bit more I think.<br/><br/>And yes, SO much of this game just comes down to the DM scratching their head and making a judgment call. Players get into such wacky situations!