Playing this and Onion is getting on my nerves. Not trying to go initially via Nightowls route but Onion reminds me of reddit instagram folks with a big mouth.
Basically.. what I figured: Green(earth-use lightning ). Frost(fire) Purple(use Holy) and Metal use lightning. Based on shapes use attack. (Upper wedge- Overhead cleaver, Six pack shit- plummet, side wedge- side attack, no wedge- thrust)