First give captain Kestler some kind of buff. He’s the captain and captains are suppose to do everything possible to keep his ship and shipmates alive. Give him a defence buff. If that’s not going to happen captains are also suppose to be the the last ones to abandon ship give him a talent that if he dies before the rest he revives with 20% hp if the last hero dies.
New pirate with the ability to steal and use a targets own special against them and makes the target a hotage. If the caster is hit the hostage is hit with the same amount of damage or if the hostage is at 25% or less hp the hostage is executed.
Both the hostage and the special theft and hit may be too much and make the hero to powerful so one or the other would be cool.