Rock Bottom is a passive item added in The Binding of Isaac: Repentance.
Effects
- Upon pickup, locks attributes to their highest values reached.
- This applies to everything that alters Isaac's attributes, including temporary buffs from activated items and pickups.
Notes
- Health downs do not count as stat downgrades for Rock Bottom.
- Isaac's stats are still calculated normally behind the scenes, only their effective values are locked to their highest point. This means picking up an item such as
Soy Milk with a severe damage penalty will make it difficult to reach a higher damage stat.
- For example, using The Book of Belial to gain +2 damage will stay in effect indefinitely, but while it's not currently activated, Isaac must earn more than +2 damage from other items to see a difference.
- For example, using
- If Rock Bottom is removed, Isaac's stats will no longer be locked, and return to match his current items/effects.
Interactions
Refer to the articles on damage, tears, range, shot speed, speed and luck for lists of items granting otherwise temporary boosts.
- A Pony / White Pony: Speed will stay at 1.5 if it was lower when discarded.
- Adrenaline: Gives a permanent flat damage bonus based on the most empty heart containers Isaac had at one time with the item.
- Azazel's Stump: Isaac will keep Azazel’s base stats after transforming back. This includes 1.25 base speed, +0.5 tears per second, and a 1.5x damage multiplier. The tear delay multiplier will not be given, including while Isaac is Azazel.
- Berserk! +3 flat damage and +0.4 speed last indefinitely. Will also give a tears up if (½ tears fired per second + 2) is a tears up, which it will be unless Isaac’s tears fired per second is already 4 or higher.
- Blood Oath: Gives a permanent speed and damage bonus based on the most hearts drained by Blood Oath on one floor.
- Bloody Gust: Gives a permanent tears and speed bonus depending on the max number of hits taken on one floor, capping at +3 tears and +1.02 speed at 6 hits.
- Bloody Lust: Gives a permanent damage bonus depending on the max number of hits taken on one floor, capping at +6 at 6 hits taken.
- Brimstone / Chocolate Milk / Monstro's Lung: Charged shot can be fired at Isaac’s normal fire rate.
- Clicker / Butter! / Tainted Isaac: Isaac will keep stat bonuses from items that he loses.
- Cracked Crown: 1.2x stat multiplier will be applied to all of Isaac’s stat ups. If Cracked Crown is dropped, the stat multiplier will not be applied to future stat ups.
- D8 / Cracked Dice: Only the highest multipliers received from the D8 will be applied to Isaac. With repeated use, a 1.5-2x stat multiplier can be applied to Isaac’s speed, tears, range, and damage.
- Dark Arts / Soul of Judas: Damage bonus will be based on the highest number of enemies / shots walked through in one use.
- Epiphora: 2x fire rate from firing in one direction lasts indefinitely after being reached once.
- False PHD: Bad pills give damage upgrades without any penalty.
- IBS / Tainted ??? / Soul of ???: Damage and tears bonus from standing on creep lasts indefinitely. This bonus is +1 damage and +1.5 tears fired per second, plus an additional 3x damage and fire rate multiplier if the creep was next to white poop.
- Ipecac: Gives Isaac a huge damage up without the tears down.
- Ipecac + Brimstone / Tech X: If Ipecac is taken before Brimstone / Tech X, its full damage up is applied to the beam/ring properly, but if the order of the items is reversed, Ipecac will only give +2 damage.
- Ipecac + Brimstone /
- It Hurts: Permanently increases tears, depending on the most hits Isaac took in one room after acquiring it.
- Jacob and Esau / Tainted Lazarus: Only the character that has Rock Bottom will be immune to stat downgrades.
- Jupiter: The +0.5 speed boost becomes permanent, turning Jupiter into a +0.2 speed up. Farts made while moving still must be charged by standing still.
- Kidney Stone: Permanently gives Isaac a x6 fire rate multiplier after firing a kidney stone. Accuracy penalty from firing kidney stones is unaffected.
- Libra: Stat balancing applies after Rock Bottom.
- Luna: Gives a permanent tears bonus based on the most secret room beams of light entered on one floor, maxing at +2.5 tears fired per second (+3 if Isaac also has Fragmented Card).
- Lusty Blood: Gives a permanent damage bonus based on the most enemies Isaac killed in one room after acquiring it, capping at +5 at 10 kills.
- Mom's Box: Doubled trinket stat boosts only apply to trinkets that are picked up while Isaac has Mom’s Box. +1 luck persists even when Mom’s Box is discarded.
- Paschal Candle: Tears bonus never goes away, even after taking damage. 5 consecutive rooms must still be cleared to get the max bonus of +2 tears fired per second.
- Purity: Taking damage causes Isaac to gain another aura’s effect without losing previous ones, allowing all 4 auras to be active simultaneously.
- Razor Blade / Golden Razor: Damage bonus will be based on the highest number of times used in a single room.
- Samson's Lock: Damage bonus given will be based on most boosts received in a single room.
- Soy Milk: Gives Isaac an insane tears up while keeping his damage, but Soy Milk's damage divider still applies.
- Taurus: Does not give a speed down, and speed boost does not reset between rooms. After reaching 2.0 speed, Invincibility will activate at the start of every room.
- Technology 2: Doesn’t decrease tears, letting Isaac fire tears at a normal rate along with firing the laser.
- Wavy Cap: Gives tears without reducing speed. Tears bonus will be based on the highest number of uses in a single room, but the distortion remains.
- Modeling Clay: Permanently increases Isaac's stats when it transforms into an item that surpasses Isaac's current stats.
- This allows the player to enter an exit a room any number of times in order to get as many stats as possible.
In-game Footage
 Jacob and Esau Unlocks 
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 The Binding of Isaac: Rebirth
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