Polarities Mod/The Phage Runner

The Phage Runner is a Hardmode book that is purchased from the for  after the  is defeated. When used, it slightly boosts the player's movement speed and defense while they are standing on solid ground, not applying whenever they are in the air for any reason.

Trivia
The title of the book may be a reference to the 2009 dystopian book series, The Maze Runner