Spell for FFVIII onward-
Bolt/Bolta/Boltaga, because calling it thunder makes no sense!!!
QFT on that one. Since when did Loud noise in sky = giant lightning bolt? NOT THE SAME

If anything it would be Lightning, Lightninga, and Lightningaga (ugghh), which is quite a mouth full, so I vote for Bolt/Bolta/Boltaga