Hunt Leader is a stamina-based medium armor set. When your pets attack an enemy you have also attacked in the last 10 seconds, you heal for 2433 Health and restore 1216 Stamina. This effect can occur once every 5 seconds.
The Hunt Leader set is part of the Orsinium DLC and can be found in the Maelstrom Arena in Wrothgar. Each set item is bound on pickup. You can acquire medium armor, weapons and jewelry of this set in the Malacath motif style