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I was also thinking about doing few healing abilities each of them covering the one of the water subbendings, IceHealing, PlantHealing, BloodHealing maybe even SteamHealing. Each of them would have their unique effects, for example the plant one will be AoE healing, the ice one will freeze the user inside "Iceberg" giving defense, heal and after few seconds it will set you free from the "iceberg"
Perhaps i will do it in few months