hmmm
mainly what Acid said. Gain tons of mutations and have tons of adventures, become really powerful, etc. Now, I’m not the Peacekeeper, so even though I have the chance to defeat Durza, I won’t, because it’s not my job.
Number two - I don’t get killed in his death, I am ordered by him to sail Northward to Hyperborea. I establish a ministry there, safe from the Peacekeeper, and I eventually get to preserve Durza’s teachings. I die a peaceful and honorable death.
It’s not water that destroy them, it’s the giant magic energy concentration in the sea. Technically, curse users could probably take a dip in the sea in WoM since that magic energy is mostly gone as far as I know.