You can channel energy (as a cleric of your druid level) a number of times per day equal to 3 + your Charisma modifier, but only to heal creatures with the aquatic or water subtype or to command them (similar to using the Command Undead feat against undead). You can take other feats to add to this ability, such as Extra Channel and Improved Channel, but not feats that alter this ability, such as Elemental Channel and Alignment Channel. The DC to save against this ability is equal to 10 + 1/2 your druid level + your Charisma modifier.