At One Minute Left, there will be a chance for Darkheart's event to occur, signaled by his sword appearing in the center of the map, the screen being tinted green, and players getting a symbol of Darkheart's smile on them. During the event, Darkheart will give all players a random curse when the timer reaches 0:54 and every 4 seconds thereafter. Before applying curses, he will talk for 2 seconds, signifying the effect he's about to apply. Darkheart has a chance to cancel the current curse. At the end of the match, or Overtime, in case of it happening, the curses applied on players will disappear. Darkheart can give players one of the following curses:
50% bound
100% jump boost
50% slow
100% vulnerable
Swapping 2 players' positions
Fling all players in different directions
Set all HP values to a random amount between 30 and 200
Phrenzy 1 was represented by Darkheart, and he moved to the top of Zuka’s truck as the method of getting into Phrenzy matches. During Phrenzy 1, Darkheart’s event is always active. His effects are the same, but they trigger much less frequently.
Other
Darkheart can usually be found fishing under the bridge leading to Blackrock at Crossroads. After the Sun vs. Moon Phestival, the player could interact with him to exchange their Sun and Moon Essence for Bux. This exchange could also be done in the Violets vs. Roses Phestival with Eggs.
Personality
Lore
Darkheart refers to himself plurally. The reason for this is unknown.