Zombies need reworked.

Make the zombie spell cast as a targeted aoe all corpses in the area(could start off small) raise in a phalanx wall formation giving you more zombies per click and providing more use cases as a wall of bodies you can put between yourself and danger in early game.

The powercharged form would b the powered zombies again in a line but now they rush forward for a second when first cast knocking back as they hit giving it a way to stay relavent to some degree in late game especially as you increase aoe.

Rename the skill to "Zombie Wall"
Could even make it work in a circle if you wanted like the other walls.

Lets be honest a single zombie crawling at the current pace has extremely limited use cases and spamming a thousand of em via spell totem shouldnt b the only way to play zombies.