Crustacean King is my favorite monster from water team. He protecc, he attacc and the most important he heals tank. I use this guy in every battle which l play with water team. He gives 2+ shield to all friendly monsters even they have shield. He protects tanks from dying by healing ability, if he's in tank position then he will heal himself. He can also do range attacks which is another advantage. Some cons of Crustacean King are low range attack, low speed and low health.
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From @smalien