If you kill the elf and magisters (or simply let her die at magisters' hands), you can loot Greaves of Contamination and Boots of Contamination.
Near the turtle's beach, there's a new shipwreck, you will find some magisters cornered an elf there. You can find the first clue of this quest at Fort Joy.
Seed of Power is a Quest in Divinity: Original Sin II. Short description goes here.
