demiurge1138
Inventor of Super-Toast
We can give them a "spell vulnerability" Sq.
Want to do something with withering vegetation or leave that as flavor?
Stone Giant Elders
Some stone giants develop special abilities related to their environment. These giant elders have Charisma scores of at least 15 and spell-like abilities, which they use as 10th-level sorcerers. Once per day they can use stone shape, stone tell, and either transmute rock to mud or transmute mud to rock (DC 17). The save DC is Charisma-based. One in ten elders is a sorcerer, usually of 3rd to 6th level.