To jog your memory- There are 8 elements, 10, if you count Light and Dark.
These are-
Magic, which is spells and sorcery.
Earth, which is rock, dirt, and even crystals and dinosaurs.
Water, which is the sea and can be fish and ice as well.
Fire, which is, well, fire, but also can be volcanoes.
Tech, which is robots and characters with gadgets and gizmos
Undead, which is ghosts and overall spooky monsters.
Air, which can be lightning, the wind, or birds.
Life, which is plants, and also bugs.
And Light and Dark are self-explanatory.