I've one piece of advice to give: pick a theme. It can be whatever, including Pokemon, classical fantasy, scientific names, magical girls, just literally pick whatever theme you like and stick to it without too much deviations. Thundamoo, author of Bioshifter, literally named a skill "Spacial Rend", purposefully replacing "t" with "c" in what should have been "spatial", all because the mc was a Pokemon fan and one particular skill there is named "Spacial Rend".
You should also try to conceptualize names - if you have a powerful skill that calls a thunder from the sky, you can call it "Thor's Fist" instead of coming up with some three word long descriptive name, which might tell the readers clearly what the skill does, but is needlessly long and makes you cringe.
Another related thing, remember that the shorter the name of the sword, the more powerful it is. Don't try to make convoluted, five-word names of something you can encapsulate in a single concept or even entirely made up name - if it's not entirely clear what the ability does after that, you can just add a short explanation to the thing or purposefully keep it vague.
As for using other languages... well, I'm not a fan. It depends what your magic is supposed to be - if you want it to be a mysterious, largely unknown force of nature, then naming spells in another language will help achieve that aura of mystery and forbidden knowledge... or something like that. But using another language for simple skills you'll be using daily (especially in regards to LitRPGs) might just needlessly complicate things.
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