There are a whole lot of them, but I'll take the fire godlike's battle-forged as an example.
As you can see on the screenshot it's active, but there is no buff icon, vfx or any other indicator that it's active neither on the character's portrait nor on the model nor anywhere else except for the combat log and burning enemies. Imo, such abilities should be displayed in a more explicit manner, especially the moment of activation or deactivation.
Green dots as the activation marker.
P.S. Crits asked me to tell the devs they'd like to be followed by screenshakes.