With practice, the fight can be done without taking any damage. But I'm not that skilled ... yet.
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1. You have to freeze the boss on the edge of the boat that's near any coastline so that you can hit it with melee weapons.
2. You have to keep it on water, or it will fly away and disappear 100%.
3. You have to make sure catapults are not collateral damage when the boss dash-smashes you. High priority! Preserve them to be reused.
4. You have to find boss spawners that are close to coastal ocean (light blue ocean) for this setup to work, because dock tiles can only be built on coastal ocean.
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