Ah, yes, you are correct about Chomp! My quick, of the top math failed me. And I seem to have been a bit to hasty reading through the document, though with the way you worded it in the VSRD, concerning backbiter, you should be able to grapple and ingest in one go, whenever you are hidden from a foe.<br/><br/>'If you make a Strength (Athletics) check to grapple a target who is unaware of your presence, you gain advantage on the check. You can choose to ingest the target as part of this check.'<br/><br/>Only the next part mentions a bonus action, which is specifically aimed at the instantly swallowed mechanic, so in my interpretation, the chain of events would go like this:<br/><br/>Grapple + Ingest (Attack 1), Swallow (Bonus Action), Grapple + Ingest (Attack 2), Swallow (Attack 3), Grapple + Ingest (Attack 4)<br/>Action Surge!<br/>Swallow (Attack 1), Grapple + Ingest (Attack 2), Swallow (Attack 3), Grapple + Ingest (Attack 4)<br/><br/>Assuming the character can retain it's stealth, which it should, as long as he or she doesn't fail a grapple check and let's their target alert the others about the sneaky nommer, it would be 4 and 2/3 swallows, which still is a bit too formidable for the cost of just a single feat. Of course, if you move the wording of the bonus action to the start, as in;<br/><br/>'If you make a Strength (Athletics) check to grapple a target who is unaware of your presence, you can use a bonus action to gain advantage on the check. You can choose to ingest the target as part of this check.'