the old dukes gift new one

allows one to swim among the clouds for ever can summon a small one is like a pet can die will go away in combat 

2 tasks  Sulphurous vortex you take the nearby water and make a vortex sucking up anyone that fails a dc 17 str save and deals 1d6 piercing damage and 2d8 acid requirs concentration to keep up 1 turn.  

4 tasks blessing of the Sulphurous sea 2 times per long rest as a reaction you can become a pile of acid water and avoid all damage. 

6 you can turn your arm into the reaper a mythical scythe that deals 6d8 slashing and 2d6 acid this can stack with two hits it can deal 4d6 and three 6d6 at the beginning of the opponents turn so if you hit them twice they would take 4d6 at the start of there turn if they dont make a dc12 + your con modifier + proficiency bonus but once they make the save the d6 damage wouldn't work and you would have to restart the damage.