>>5143112>Gardy's memory core likely had a lot of information in regards to fighting pretender era necromancy.That he does.
>His body would know what element would be more likely to pierce a necromancer's defenses and/or how a given element would best be "weaved" so as to circumvent any potential defense right? There's no particularly effective element here unless the necromancy change/enchant his body. Fire is particularly effective against putrid flesh and to burn out a big amount of weak summons, lightning works as a general catch-all, ice is great to control the field and potentially skewer a human dead in one lucky blow etc.
For now, your working on speed above strategy so you can't make an informed decision about what to do. Gotta judge the situation at hand and try your best!