I just thought of a spell:
Age Spell
Elixir: (not sure) 26,000-35,000 (increases as leveled up)
Radius: 5-7 tiles (increases as leveled up)
Duration: The aged building stays aged. But the potion (particles) would disappear in about 3 seconds after its deployed leaving the building looking dull and dusty.
Housing space: 2
Weakness: 50%-70% of the buildings health (increases as leveled up)
This putrid smelling potion when used makes buildings brittle and weak. Not decreasing their damage, these potion come in handy if you don't have a lot of time.

