Dragonborn Frenzy.You'll have to give a bit more information or context I think.
A dragonborn might have zeal, but having "a" zeal isn't something that i can think of.
It's a racial feat from 4th edition D&D, which gives dragonborn +2 to attack rolls when they are "bloodied." A character is "bloodied" when they have lost half or more of their total HP.Dragonborn Frenzy.