First and foremost, OMG LOKIII!!!! <3
Back on topic, Arcadios' "sacrifice" was somewhat useless, he could have pulled them up instead of jumping in. I guess that guy isn't really smart. Good thing that clock (I admire everyone who can remember that name) was there right on time. Although, he must have been in that lava for quite a long enough to get serious burns. I really hope Arcadios will die eventually because otherwise it would be ridiculous. That guy was standing in lava for several minutes. I doubt he would have any chance to survive irl without immediate medical help (maybe even with it).
Though, I'm glad the girls got their keys back. It looks like serous shit will go down in their fight (I'll be let down if that won't be the case). Especially if it's just some random stalling that won't affect anything. Anyway, I hope next chapter will pick up on pace. This felt too short.