Master Round

Master Round is a passive item. There are five variants of the Master Round, each of which is acquired by defeating the corresponding floor's boss without taking damage.

Effects

 * Grants a heart container.

Trivia

 * The synergy is a reference to Master Chief from the Halo video game series.
 * Lil' Bomber used to be able to synergize with the first Master Round for the synergy, but was removed because it was too easy to obtain.