Well, the first one is an Enhancement spell, best guess is that particular one interfaces weirdly with elven biology, unless...? no, some of the humans tested it too, and humans here seem like humans back home. This second one is a spell Malak had never actually cast themselves, that's probably just an imperfect description from imperfect memory. The third one might be behaving weirdly just because this is a different plane, if the connection to the plane of shadows is a little bit off that might mess up some Darkness spells like this...
Oh that's pretty good progress on plane shifting, well done! But. Oh, shit. Um, this was almost really bad, fortunately the elves haven't developed the mana capacities to actually plane shift successfully because this spell does not have precise enough targeting. For weird reasons that are probably mostly theological and not really things Malak studied, it's weirdly easy for spells to mix up Heaven and Hell and so while this was a good idea assuming the plan was to fetch some angelic help or start evacuating people it would probably have been a coin flip between Celestia and Baator. And it wouldn't even have been obvious, devils have some really nice looking parks and open spaces in Hell probably for exactly this reason because they are universally awful.