Rebar Rock
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Rebar Rock is a rock trinket added in The Reheated Update.
Effects
- 25% chance to prevent any damage taken towards
Red Hearts inside of 
Red Heart containers or 
Bone Hearts in the health bar. - All damage taken to Red Hearts in the health bar is reduced to half of a heart, similarly to
The Wafer effect.
Notes
- Golem will still gain invincibility frames and activate on-hit item effects whenever damage is prevented.
- Rebar Rock can prevent and reduce damage that would be dealt towards
Rotten Hearts and 
Morbid Hearts in the health bar. - Damage to
Eternal Hearts can only be prevented if there are no 
Soul Hearts or empty Bone Hearts in the health bar. - The effect can both reduce the damage, and have a chance of blocking the damage of item effects that deal self damage to Golem, as well as
Blood Donation Machines and 
Sacrifice Room spikes.
Interactions
Trinket Multipliers / 
Henge Rock: Affects the chance to block damage, based on Rebar Rock's multiplier — the maximum chance to block damage is 50% with a multiplier of 2. Additional trinket multipliers will have no further effect.
Blood Rights / 
Kamikaze! / 
IV Bag / 
Razor Blade: Rebar Rock can prevent and reduce the damage from these items while still retaining their effects.
Blood Oath: The damage from Blood Oath will take a random amount of Red Hearts from the health bar, as Rebar Rock can block the rest of the damage that would be dealt to the rest of the Red Hearts. Blood Oath will only provide the amount of damage and speed based on the amount of Red Hearts that have successfully been taken, and if no hearts have been taken, will not provide any damage and speed increase.
Potato Peeler: Will take two Red Heart containers while holding Rebar Rock. Damage taken will not be prevented. (NOTE: This is a bug.)
Azurite Spindown: Using Azurite Spindown on Rebar Rock rerolls it into 
Carnal Carnelian.
