Till The Well Runs Dry is a side quest in Might & Magic: Heroes Online.
The Black Fang water warden reports some naga have taken the water supplies and are building a dam. The hero can go to their fortress in the north and besiege it. Next, the hero has to confront the Jade Coast wanizame, which have collected the stoplogs to construct the dam. Upon their defeat, the hero has to collect this wood and report to the water warden for some crystals as reward.
Sometimes, the Jade Coast kappa's icon can be placed in stead of the wanizame, while facing the wanizame dam builders.