You can now win single-use Perk cards by competing in Castle Creep TD events! There will also be a chance you could find one in a chest so keep your eyes peeled.

By equipping Perks to Towers and Heroes you will can trigger a variety of abilities that will make them stronger against the Creeps.

Just remember, Perks are consumable which means you can only use them once. You can also only equip one Tower mod and two Hero mods (one for each Hero) so choose your strategy wisely!