Sentinel - max number of times it can proc in a turn?
I'm looking at feats for my Monk. Last night we were fighting the phase spiders and the spiderlings came in. Because we hadn't spread out enough, all of them came towards our group, so they were within melee range of me. I'm wondering if I would've gotten a reaction attack against each one (so... 6?), or if it's a once-per-turn thing. Thanks.
Reactions take a resource like an action, bonus action, etc do. You can see the resources that each reaction you have takes from your character window, there is a reaction button at the top somewhere. The purple star is the reaction resource and you should find that sentinel takes one of those, therefore you can only use it once per turn.