While in the battle, you can tap and hold the Buff icon and read what it does.
Here is a list of heroes who can apply this buff:
- Robin Bad (Ability 3)
- Niya (Ability 3)
- Snorri (Ability 1)
- Garrett (Ability 3)
- Solius (Leadership Ability)
- Rantha (Leadership Ability)
- Maar ( Ability 3)
- Sharp (Ability 1)
- Kiana (Ability 1)
- Count Delman (Ability 3)
- Telias (Passive Ability)
- Instructor Gorram (Passive and Leadership Ability)
- Arno (Ability 1)
- Kin Li ( Ability 3)
- Master Duo (Ability 3)
- Uncle Ho (Ability 2)
- Lei Zi (Ability 3)
- Tomby (Ability 3)
- Roxy ( Passive Ability)
- Boreas (Ability 3)
- Sindri (Ability 3)
- Zappy (Passive Ability and Ability 1, 3)
- Tobald (Ability 3)
- Archi & Ro (Ability 3)
- Bar & Rel (Ability 3)
- Venomate (Ability 3)
- Shadar (Leadership Ability)
- Slinger (Passive Ability)
- Buff (Ability 2 - one of the possible buffs)