The below spells are ones that I think can be implemented that have come from players.

1. Spell that creates a Swamp tile (slows movement)
2. Spell that turns a group of tiles into ones that do damage if you walk through them.
3. Meteor Strike – spell that destroys everything in it, leaves crater.
4. Wall of Fire – tiles do damage to anyone who walks through them.
5. Tsunami, huge wave of water is conjured up that wipes out units
6. Your spell idea here…

(will be reading comments, I have read several threads already on the subject and picked spells that were feasible and/or ones I thought would be fun).