In-game card description:
"Rarity: B. HP: 500. BP: 500. Output Force: one Yellow Force.
STORM BRINGER. Use Cost: one Yellow Force. Choose one Character Card to KO. 200 HP is then restored to your HP level.
Heidern's the globetrotting contractor who leads Ralf, Clark, Leona, and Whip. His main focus seems to be KOF. He's sent Ralf and the gang here more times than he'd liked. But this is always where the action and big bucks are."