"Support Pillars" that would be in the world building menu section of things, that when destroyed, causes the placement of new terrain. So a person goes into a mine, breaks the pillars crushing whatever is under it (Or being crushed from such).
"Gunpowder barrels" that when set on fire, cause an explosion(Breaking nearby things perhaps).
Environment Spell additions to current spells already ingame. Such as:
Vines creating plants.
Freezing Ray putting snow or ice inbetween the target and caster.
Fireball burning things on the way as it reaches it's target.
Peircing Arrow shot with the capacity to go *through* some objects, like trees.
Certain terrain causing different effects as well, hiding in a bush to increase one's stealth, being in the water making you slower, swamp slowing you down, "dream lands" terrain (if it existed for instance) could provide benefits for the player, or maybe hostile to their now mortal form. If there was lava, it setting a person on fire if not with the correct fire resistance gear.