Mega Blast

Mega Blast is a secret unlockable activated item added in The Binding of Isaac: Afterbirth.

Effects

 * Upon use, Isaac fires a giant, incredibly powerful blood laser, similar to the one used by Mega Satan, for 15 seconds.
 * The beam deals Isaac's current damage multiplied by 5 per tick.
 * The beam has enough power to push Isaac backward while being fired and will last between rooms, and across multiple floors.
 * The beam has spectral and piercing effects.
 * The beam can be moved while firing in many angles diagonally.
 * While Mega Blast is being fired, Isaac cannot:
 * Open chests.
 * Pick up a Little Battery, collectibles, pills, trinkets, or cards or runes.
 * Pick up the trophy or enter the chest that spawns after defeating Isaac or ???.
 * Sleep in a bed.
 * The laser extinguishes fires, detonates TNT, and destroys poop.

Synergies
All synergies and interactions pertaining to pertain to Mega Blast, with the following exceptions and additions:
 * : Beam will continue to fire when switching to another active item. Other active items can be used while the beam is firing.
 * : Item will gain charges for dealing damage, which is especially effective when fighting bosses with large health pool.

Interactions

 * : The beam does not split.
 * : No effect.
 * : No effect.
 * : Familiar fires normal tears while Mega Blast is in use.

Trivia

 * Mega Blast's collectible sprite is called 'Mega Satan's Breath' in the game files, which may be its initial name.

Seeds
WCB1 YZ39 (First floor Devil Room) TQWA 6TQD (Curse Room adjacent to spawn, chest teleports to Devil Room) 3KY4 LSVL (Second floor Devil Room) RZL2 6MQ0 (Starting item as Eden, and will also start with ) S3VX RPWZ (Starting item as Eden) XGYR 11TV (Starting item as Eden) L6B9 ZZ22 (Starting item as Eden) NZ7T 4RAJ (Starting item as Eden) W3BZ BBB2 (Starting item as Eden) PGH7 BMRT (Starting item as Eden) PLXX XCLR (Starting item as Eden)