Healing from MoK

[Ele]

It heals something like 6-10 hp (changed several times over the course of kunark/velious era) every single time a melee hit lands.

If you have a fair number of melee in your party, it is worth it to cast it every few mobs to top up the non-tank melee that get damaged. The faster weapons they use, the more healing they get.

For boss mobs in Velious where it lands, it becomes epic.

Had a ranger tank using Rev Whip and Moss Covered Twig in Howling Stones with 3 other melee in the group, only had to cast Mark of Karn to keep them all healed.