Sprun

Sprun is a passive item added in A Farewell to Arms update.

Effects

 * Stays near the player and will block bullets, but does not orbit like guon stones.
 * Upon being picked up, it assigns a trigger randomly from the list of triggers (see below).
 * Upon satisfying the trigger, it awards the player Windgunner for a short period.

Triggers

 * Player uses their last blank.
 * Player takes damage to hearts.
 * If playing as the Robot, taking armor damage also counts.
 * Player loses their last piece of armor.
 * Player goes down to half a heart.
 * Player's gun runs out of ammo.
 * Player is set on fire.
 * Player takes damage from electrocution or poison.
 * Player falls into a pit.
 * Player flips a table.
 * Player uses an active item.

Trivia

 * If the player has Excaliber, Sprun will gain two triggers instead of one.
 * This is a reference to Spren in the Stormlight Archive, the first book being The Way of Kings . Spren are required to become a radiant, one of which is a Windrunner. The protagonist, Kaladin, is forced to carry bridges and is also a Windrunner. The item also resembles a Lifespren.
 * While the glitch that takes place when the Sprun is dropped is likely unintentional, it bears a resemblance to the way the bonds between Radiants and Spren work in the Stormlight Archive.
 * Sprun will actually assign two triggers every time. There exists a synergy that allows the item to make use of the secondary trigger — making it so that there are two ways to activate the item. The secondary trigger would always be a different one. Despite both items being available in the game, this synergy is disabled and cannot be obtained.