- Primary Unlock: Complete the Ascent path to secure the most powerful the binding of isaac repentance tainted unlocks like Glitched Crown and Spindown Dice.
- Best Strategy: Leave a trinket in a Treasure or Boss Room during the descent so it transforms into a Cracked Key during the Ascent.
- Top Unlocks: Focus on Tainted Isaac, Tainted Lilith, and Tainted Lost first to drastically improve the global item pool.
- Critical Warning: Red Heart damage during boss fights directly reduces Devil and Angel Room generation chances.
Overview of Tainted Character Unlocks
Tainted characters represent the ultimate progression milestone in the Repentance expansion. Unlike normal characters, Tainted variants feature highly specialized, high-risk mechanics that completely rewrite the core gameplay loop. Unlocking these characters requires players to master the Ascent route, a reverse-floor sequence leading back to Isaac's Home.
Each of the 17 Tainted characters features a unique post-it note of completion marks. Completing these marks on Hard Mode unlocks some of the most powerful, run-defining passive items, active items, and consumables in the entire game. Prioritizing the right bosses with the correct characters is essential for improving your global item pool without cluttering it with low-impact items.
| Character | Unlock Requirement | Key Starting Tool | Playstyle Focus |
|---|---|---|---|
| Tainted Isaac | Use Cracked Key in Home closet as Isaac | 8-slot passive item limit | Inventory manipulation, cycling rewards |
| Tainted Lilith | Use Cracked Key in Home closet as Lilith | Gello whip fetus familiar | High-range whip attacks, summon scaling |
| Tainted Lost | Use Cracked Key in Home closet as The Lost | Flight, spectral tears, Holy Card | Glass cannon, high-quality item filter |
| Tainted Keeper | Use Cracked Key in Home closet as Keeper | Quad shot, fading coin drops | High economy, shop-centric progression |
| Tainted Judas | Use Cracked Key in Home closet as Judas | Dark Arts pocket active | Temporal invulnerability, bullet slicing |
Always play on Hard Mode when pursuing Tainted unlocks. This ensures you acquire both the normal and Hard Mode completion marks simultaneously, saving hundreds of hours of gameplay.
S-Tier Tainted Unlocks and Item Rankings
The items unlocked by defeating endgame bosses with Tainted characters are not created equal. Some, like Glitched Crown, can single-handedly guarantee a victorious run by giving you unprecedented control over item generation. Others, like TMTRAINER, are purely chaotic and should be unlocked later to avoid disrupting your standard progression.
Our 2026 tier list prioritizes unlocks that offer universal utility, massive stat multipliers, or game-breaking synergies across almost any character build.
Glitched Crown (S-Tier)
- Unlock Source: Defeat The Beast as Tainted Isaac.
- Core Effect: Pedestals cycle rapidly through 5 different items.
- Best Use: Gives you a 5x higher chance to find S-tier items in every single item room.
Spindown Dice (S-Tier)
- Unlock Source: Defeat Delirium as Tainted Isaac.
- Core Effect: Decrements a pedestal item's internal ID by 1.
- Best Use: Predictably convert common items into top-tier rewards like Sacred Heart.
Twisted Pair (S-Tier)
- Unlock Source: Defeat The Beast as Tainted Lilith.
- Core Effect: Spawns two close-following babies that copy your tears.
- Best Use: Acts as a massive, direct damage multiplier that scales with your offensive stats.
Sacred Orb (S-Tier)
- Unlock Source: Defeat The Beast as Tainted Lost.
- Core Effect: Automatically filters out low-quality items from all pools.
- Best Use: Guarantees that late-game chests and secret rooms only yield high-tier items.
Below is the complete ranking of the most impactful the binding of isaac repentance tainted unlocks available in the game, categorized by their source character and target boss.
| Item Name | Source Character | Boss Target | Item Type | Tier Rating |
|---|---|---|---|---|
| Glitched Crown | Tainted Isaac | The Beast | Passive | S-Tier (★★★★★) |
| Spindown Dice | Tainted Isaac | Delirium | Active | S-Tier (★★★★★) |
| Twisted Pair | Tainted Lilith | The Beast | Familiar | S-Tier (★★★★★) |
| Sacred Orb | Tainted Lost | The Beast | Passive | S-Tier (★★★★★) |
| Soul of Isaac | Tainted Isaac | Hush & Boss Rush | Soul Stone | A-Tier (★★★★☆) |
| Dark Arts | Tainted Judas | Starting Active | Pocket Active | A-Tier (★★★★☆) |
| Lemegeton | Tainted Bethany | Starting Active | Active | B-Tier (★★★☆☆) |
| TMTRAINER | Tainted Eden | The Beast | Passive | C-Tier (★★☆☆☆) |
While TMTRAINER (unlocked via Tainted Eden) is incredibly fun, it replaces all future item pedestals with glitched, unpredictable items. Avoid unlocking this until you have completed most of your serious hard-mode post-it notes.
Step-by-Step Guide to Unlocking Tainted Characters
Unlocking Tainted characters requires a highly specific sequence of actions during a standard run. You must bypass the traditional ending paths and prepare a gateway tool before descending into the depths. Follow this precise routing guide to secure your first Tainted variant.
Drop a Trinket in a Boss or Treasure Room
During your descent through the main floors (Basement to Depths I), find any standard trinket. Drop this trinket directly inside a Treasure Room or a Boss Room. When you return to this room during the Ascent phase later, the trinket will have transformed into a Cracked Key, which is required to open the hidden closet in Home.
Locate the Marked Skull in Depths II
On Depths II, search the floor for a tinted skull marked with a small, faint cross. Bombing this skull is guaranteed to drop The Fool tarot card. Do not use this card immediately; save it for after the main boss fight.
Defeat Mom and Teleport Out
Enter the boss room on Depths II and defeat Mom. Pick up either The Polaroid or The Negative from the pedestal. Immediately use The Fool card to teleport out of the boss room, returning you to the starting room of Depths II.
Open the Strange Door
Approach the large, ominous door with a square slot in the starting room of Depths II. Touch the door while holding either The Polaroid or The Negative. The door will consume the photograph and swing open, granting access to the Mausoleum / Gehenna II alternate floor.
Ascend to Home and Unlock the Character
Navigate through Mausoleum II, defeat the alternate boss, and grab Dad's Note. This initiates the Ascent. Run backward through all previous floors until you reach Home. Sleep in Mom's bed to open the hallway, walk to the living room, and use your Cracked Key (or the Red Key if found in Mom's Chest) on the red outline on the hallway wall to reveal the Tainted character closet.
You only need to drop a single trinket to get a Cracked Key. Leaving it in the very first Boss Room on Basement I is highly recommended, as you are guaranteed to pass back through it during the Ascent.
Strategic Roadmap for Completion Marks
To efficiently secure the best the binding of isaac repentance tainted unlocks, you must plan your character-specific boss runs. Rather than attempting full-clears randomly, target high-priority bosses that offer the most powerful item rewards first.
| Target Boss | Completion Mark | Difficulty | Recommended Character | Reward Value |
|---|---|---|---|---|
| The Beast | Dad's Note | Moderate | Tainted Lilith / Tainted Isaac | S-Tier (Unlocks Twisted Pair & Glitched Crown) |
| Delirium | Torn Paper | Hard | Tainted Isaac | S-Tier (Unlocks Spindown Dice) |
| Hush | Blue Face | Hard | Tainted Lost / Tainted Keeper | A-Tier (Unlocks Soul of Lost & Soul of Keeper) |
| Mega Satan | Brimstone | Moderate | Tainted Judas | A-Tier (Unlocks Dark Arts upgrades) |
Tainted Run Preparation Checklist:
- Enable the Found HUD option in the settings menu to track exact stat values during runs.
- Practice holding the drop button (default: CTRL or RT) to consistently position your trinkets.
- Unlock Holy Mantle for the Lost by donating 879 coins to the Greed Donation Machine first.
- Complete Challenge #2 (High Brow) to unlock the Rune of Jera for easy duplication setups.
The Beast fight utilizes a unique side-scrolling perspective where conventional gravity applies. Homing tears and orbital familiars are exceptionally strong during this fight, as they bypass the awkward aiming angles caused by the scrolling arena.
FAQ
Q: What happens if I forget to drop a trinket during the descent?
If you reach Home without a Cracked Key, you can still unlock the Tainted character if you have already unlocked the Red Key. Opening Mom's Chest in her bedroom is guaranteed to drop the Red Key on your very first visit to Home. On subsequent runs, however, the chest only has a small chance to contain it, making the trinket method mandatory.
Q: Can I unlock multiple Tainted characters in a single run?
No. You can only unlock the Tainted variant of the character you are currently playing as. To unlock Tainted Lost, you must complete the Ascent path specifically playing as normal Lost.
Q: Do Tainted characters have their own challenges?
Yes, several late-game challenges require Tainted characters. For example, Hot Potato features Tainted Forgotten, Cantripped! uses Tainted Cain, and DELETE THIS features Tainted Eden's glitched mechanics. Completing these unlocks powerful reversed tarot cards.
Q: Why did my dropped trinket not turn into a Cracked Key?
Ensure you dropped the trinket inside a Treasure Room or a Boss Room. Dropping it in normal combat rooms, shops, libraries, or secret rooms will not trigger the transformation during the Ascent.
Securing all completion marks on every Tainted character is the final requirement for unlocking Death Certificate and achieving the ultimate 'Dead God' save file status in 2026.