Grids

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Grids and Slots
Grids	Slots
Rune Rocks	Swine Beggar	Demonic Swine Beggar	Angelic Swine Beggar	Daedalus Statue	Gashapon	Butapon	Red Pillar	Curse Trader	Bougie Pedestal

Grids are obstacles whose function is mostly to block the path or define the shape of the rooms. Sometimes they can have special properties that can be utilized by either the player or the enemies or simply exist, affecting how the room itself works.

Currently, Retribution adds only one new Grid.

Rune Rocks

Rune Rock

Rune Rocks are an unlockable Grid that can randomly replace regular rocks, similarly to how Fool's Gold works in vanilla. When blown up, Rune Rocks perform a more powerful version of the rune effect they are invoking.

• Rune Rocks have a 1/256 base chance to spawn per room, however this can be boosted by various effects:
  • While in a Special Room (e.g. Boss Rooms, Treasure Rooms, Secret Rooms, etc), an additional 1/24 chance is added.
  • Scaling with Planetarium spawn chance, up to an additional 1/64 chance can be added.
  • Any player owning Crystal Shard will double the spawn chance.
• When a Rune Rock spawns, it has a 2/3 chance to be assigned a random rune symbol etching.
  • Etched Rune Rocks perform their ascribed effect when destroyed, while non-etched rocks perform an effect at random.
  • While in Treasure, Boss, Secret, and Ultra Secret rooms, Etched Rune Rocks have a 50% chance to specifically gain the Perthro or Jera etchings.

Interactions

• Crystal Shard: Increases the chances of Rune Rocks appearing. Equivalent to a chance multiplier of cumulativeGlobalTrinketMultiplier + 1.
  • Also causes broken Rune Rocks to spawn Rune Shards when destroyed, just as Crystal Shard does to normal Rune consumables.
• Mom's Bracelet: Rune Rocks can be lifted and carried as expected, allowing beneficial effects to be transferred to a more useful room. For example taking Jera to a Devil Deal, or Algiz to a Boss Room.
• Clear Rune: Using Clear Rune in a room containing a Rune Rock will mimic the effect of the Rune Rock.
  • This does not prevent Clear Rune from mimicking Runes in Isaac's pocket. Both the consumable and rock are mimicked simultaneously, and only the greatest mimic charge is applied to Clear Rune.

Effects

Name	Icon	Effect	Mimic Charge
Hagalaz		Destroys every single grid entity Unlocks all locks. Opens all doors.
Jera		Activates the Diplopia effect.
Ehwaz		Creates a Crawlspace entrance.
Dagaz		Clears all Curses from the floor. Increases Angel Room chance. Spawns 2 Soul Hearts.
Ansuz		Reveals the entire map, with Ultra Secret Room included. Spawns a Cracked Key.
Perthro		Rerolls all items in the room into items of higher quality.
Berkano		Spawns 9 Blue Spiders and 9 Blue Flies or random Locusts.
Algiz		Activates the Book of Shadows shield for 30 seconds. Grants one charge of Holy Mantle.
Mannaz		Grants Kapala's damage-splitting effect for 2 rooms, and its Damage buff to Isaac for 1 room.
Naudiz		Spawns Spoils Coins and Cursed Spoils Coins for 20 seconds.
Thurisaz		Attempts to upgrade all enemies in the room into their stronger variants. If an enemy is successfully upgraded, its health is reduced to 25% of its original value.
Wunjo		Spawns 5 Joy pills and 1 Euphoria pill.