Soon as the tank engages the boss from the dock, Morpheus and his cannons will attack. Make sure the healers keep the tank's HP up as he will be taking aggro the entire fight. Attack morpheus using the siege tanks or cannons. Rotate the shots as Morpheus will easily disengage and this resets his HP.
Keep an eye out for pirates! Morpheus will not attack pirates as he is a pirate himself. Therefore, it does not take much for pirates to mess up your attempts on killing Morpheus.
-Using a specific item named "Shahozen's Hammer", this NPC could be stunned indefinitely more or less. GM was alerted to this and removed all the items gained through this way. But another GM's stance was that it wasn't a bug. }