While the special effects have UI to show the cooldowns for their powers in the original origins mod, the Hissling does not. I have not tested the Dragonborn but i assume it is the same.

The cooldown is not supposed to show for Hiss-kin as it's half a second long and is more meant so the player doesn't hold the button down (resulting in uncontrollable spam).

Dragonborn's does show

The cooldown is not supposed to show for Hiss-kin as it's half a second long and is more meant so the player doesn't hold the button down (resulting in uncontrollable spam).

It would still be nice to be able to see when you are able to use it. Regardless of having a quick cooldown, its better to know there is an actual cooldown to know when it is able to be used and have less players confused about why it isn't working.