Woundweaver
Explorer
Perhaps I'm reading this incorrectly, but the spell watery grave on pg 216 of OLD-HB-ONS-v1_2-draft06 seems like you could for very few MPs destroy a castle. Turn 5' high by 50 foot diameter section of a bulding's wall to water from 100 ft away.
Or even clear out a dungeon by turning the upper levels to water and let the water flow down and start drowning people.
Or even clear out a dungeon by turning the upper levels to water and let the water flow down and start drowning people.