Corrupt Heart

The Corrupt Heart is the final boss, fought in Act 4. It is very powerful; its innate powers and buffs it gains throughout the fight can prove very difficult to counter. Because of its Invincible buff, it can only take 300 (200) damage per turn, rendering strategies that rely on heavy damage less effective. Additionally, it will gain incredible amounts of on its fourth buff and onward, so killing it quickly is also important.
== Pattern ==
Always starts with Debilitate. Uses Buff every 3 turns starting from turn 4.
Otherwise, has a 50% chance of using Blood Shots followed by Echo and a 50% chance of using Echo followed by Blood Shots.
Name 	Intent	Effect
Debilitate 	 	Applies 2 , 2 , and 2 in that order. 
Shuffles a , , , and a into the draw pile.
Blood Shots	 	Deal 2 x 12 damage.
Blood Shots	 	Deal damage.
Echo 	 	Deal 40 damage.
Echo 	 	Deal damage.
Buff 	 	Remove all debuffs, gain 2 and additional buffs:
1st Buff: 2
2nd Buff: Beat of Death 1
3rd Buff: 
4th Buff: 10
5th Buff onward: 50
== Tips ==
* Strength reduction and/or damage reduction is very effective against The Heart, since its Blood Shots only deal 2 damage initially. This includes:
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* Do not use either of the first two cards in this list on a turn where The Heart buffs. It will clear the strength down debuff, then gain back the strength you made it lose from the card, essentially making you give The Heart free strength. 
*Any source of will also be extremely valuable against both of The Heart's attacks.
* Sources of damage negation such as and can be very effective against the Echo attack. is also reasonably useful against Blood Shots, as it will always lower the damage to 12 (15), whereas would only negate 1 (2) of the attacks.
* Any effect that triggers on-damage or on-attack is very good against The Heart due to it triggering 12 (15) times for each Blood Shots that The Heart does. This includes:
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* can be useful against The Heart, as it will allow you to remove the many statuses it will inflict on you, but beware of its Beat of Death power, as it will trigger whenever you play any card, including curses and statuses.
* or can completely negate Beat of Death 1. Both of these, or 2 copies of , are necessary to negate Beat of Death 2, applied on The Heart's second Buff action.
*Because does not affect buffs on enemies, the Invincible damage cap is not reset for the extra turn.
==Update History==
*Patch V2.0: The Watcher
**Slime and Heart enemy SFX no longer play when game is backgrounded.
*Patch V1.1: The Dealer
**Fixed Invincible power with interactions such as The Boot and Block.
*Weekly Patch 55: Blur
**Adding VFX for the Heart's buff move.
**Adding VFX for Heart's debuff move.
*Weekly Patch 53: Blizzard
**Beat of Death Power now damages you after a card's actions completely resolve.
**Invincible Power tooltip now correctly matches the icon and shows the correct amount.
Category:Boss Monster
Category:Act IV