He is one of the first arrives to Dreamstone Reef. He did not pass Vashier’s trial and chose to remain. However, his refusal to die was twisted and ehanced by the Island to the point where he became a sapient undead.
Akrashun dispises the Whispershore Haven outpost. He sees it as a symbol of weaknes, and believes that the reason peaople choose to stay on this island is because they do not realize that they need straeght to leave. If fosters weakness into those poor souls chose by Veshir, and by staying at Whispershore Haven they get a false sense of controll and security.
To stop this, and help those poor sould that do land on this island, Whispershore Haven needs to be destroyed.
As a reward Akrashun will give the party Mark of Akrashun