Sisu

Sisu is a custom Power-Up featured in Ephemeral Sun, Everlasting Moon by btal72.

Overview
Sisu appears randomly after killing any zombies. When picked up by a player, it will grant the player (that picked up the Power-Up) a temporary unlimited health boost, unlimited ammunition (reloading still required), and a double damage multiplier against all enemies. Sisu wears off after 30 seconds.

Appearance
This will have the typical green-yellow glow with the floating and rotating gold icon. The icon for Sisu is a raised fist icon.

Trivia

 * Sisu is the name of the Finnish quality and cultural construct describing determination, willpower, grit, bravery, resilience, hardiness and more.