I've been wanting to make an IKEA-themed "swedish magic" mod that is themed around summoning stationary objects and pets after N turns of "assembly" delay (can pets cast spells to root themselves?). It would also be themed around making spells cheaper (but weaker). I'd really appreciate if it were possible to create and sacrifice blockers with spells (kind of like corpse burst with the sacrifice). There would need to be a way to avoid allowing the player to destroy things like shrines and levers of course. I understand that since I haven't actually made and posted a mod yet this may not be taken too seriously. Right now working on one that adds a few low level and end game wands.
There is a modding requests thread in the modding forum, so from now on you can post there. This can be done using paralyzed monsters and taxa without requiring this though. I'll suggest that you look at J-Factor's Chronomancy mod, particularly the Grandfather Clock Paradox.
You can make temporary objects via a template spell that has <effect type="create" /> Code: <spell name="Frozen Barrier" type="template" templateID="21" anchored="1" downtime="27" icon="sprites/dfa_frozen_barrier_32.png" > <description text="Add a top, and it's an igloo!"/> <effect type="knock" amount="1" /> <effect type="create" turns="6" objectSprite="sprites/sfx/icebarrier/icebarrier0000.png" self="0" /> <anim sprite="sprites/sfx/icebarrier/icebarrier" frames="3" framerate="90" sfx="ice" /> </spell>