I think with just electric & voodoo, we're missing some aspects of support magic. With all this sand and dirt around us, why not use it?
In mechanical function, being able to blind and physically block enemies would be particularly flavorful
Another idea, putting stone armor around yourself for a temporary DR or additional temporary small healthbar.
So here's some ideas for Jokers in the progressive list format of the other spell trees
Brick/Rock
- throw a rock or brick at an enemy for a chunk of damage, no AOE, can hit headshots
- short CD, like the other lv1 Jokers
- both names are fine, but throwing a brick at someone is hilarious
Pocket Sand
- throw sand at enemies, blinding them temporarily and creating small spots of quicksand that slow enemies passing through
Boulder
- roll a large boulder forward, barreling through enemies and maybe leaving quicksand
- Indiana Jones
Bastion
- create a vertically large wall of rock that blocks enemies
- useful for putting a LOS blocker for ranged attackers like the train or a carriage
- can create choke points or give a temporary reprieve to heal with voodoo
- birds and other flying enemies can still fly over it, ground quakes from minibosses will still pass through
Stoneskin
- either in an AOE/target self/target ally
- give a temporary yellow HP bar or give a moderate amount of damage reduction for a period of time
Earthquake
- create a rift of earth that throws projectiles creating quicksand spots, sort of like geyser but in a larger area & duration given the long CD
- INTERACTION: hitting it with another specific element or spell, maybe something lightning? Creates a dust devil like the fire tornado