Spells -- Ordered by Ease and/or Importance

Enabling, underlying functionality

Easy, High importance

Morale
Rally
Conjure Zombie Infantry
The conjure spells introduce military units, almost all the functionality of which we must support anyway. Zombies seem out-of-character for some spell casters, and special rules for the turn conjured sound like a pain

Easy, Low importance

Manna Transfer
do some arithmetic on a couple characters' current manna points
Teleportation protection
apply a flag to affected units/characters within caster's hex. use that flag in Teleportation.

Medium difficulty, Medium importance

Force Wall
Temporary hex-side traits that prohibit enemy movement and attacks.