well, in thinking about this more I realized that I’ve never used magical exhaustion as…the source of the whump, I guess you could say; it’s mostly been kind of a side effect of Other Bad Shit, partly because magical exhaustion (and internal resource depletion in general, I guess) is an easy way to handwave beating up somebody who’s canonically really durable. but, hmm, fics of mine where that’s a bigger part of the premise…
speed the collapse (scatter what remains) – not so much magical exhaustion as magical…autoimmune disorder? basically, the Other fucked with his magic and it eventually broke after he reached Earth, turning on Loki and making him really, really sick. trying to use it just makes things worse.
Avengers Academy: Friendship Is Magic – obviously this is Avengers Academy Loki but I inevitably write him as strongly influenced by my understanding of MCU Loki, and this fic is whump based on somebody trying to cut off his magic. (if you’re not familiar with Avengers Academy, you can pretty much just think of it as an AU where most of the major characters are much younger and in school together.)
winter in our bones – Loki falls from the Bifrost to Earth and gets snapped up by HYDRA when he’s still half-dead from the fall (also, in this AU, Steve is the Winter Soldier). this one definitely goes in the “magical depletion as a handwave so I can beat him up” category.
all turn to fire – Infinity War speculation based entirely on trailers. Loki exhausts himself softening the Statesman’s crash landing and doesn’t have much left to fight Thanos, which is why he resorts to bargaining away the Tesseract.
clearly, I need to write something more specifically about magical exhaustion, because that’s a fun variety of Loki whump that I’ve only sort of used.