Talk to Willow Bluerose
Willow: Your dad has been turned into an undead reaper, to find out where he is stationed, defeat Heartripper, the witch king, Ecsyth, and terror to find Nick.
After doing that, talk to Sadie club heart, she'll tell u that nick is an undead reaper boss who now is known as Sharkripper.
Defeat Sharkripper to bring Nick back to life
Reward: Sharkripper's scythe.