The player's Bark Skin increases their chance to block damage.
Bark Skin adds a chance for the player to not take damage where they otherwise would through Enemy bullets or contact damage. Upon being activated, a "Blocked" message will appear, and the player will have their invincibility frames activated, however their health will remain the same. In addition, when playing as Thyme the day will not decrease. Bark Skin is also capable of blocking Hotwire's damage, though the invincibility frames will not block further Hotwire damage, due to how Hotwire works. Initially, the player's save begins with zero Bark Skin, which cannot be increased through any Items during the run. Bark Skin can only be increased through Cat Plushies, Cat Shrines, Home Improvements, and Topiaries. Unless otherwise stated, all of the following increases are permanent and will affect all runs after being obtained. The specific sources can be seen below:
|Alien Ant Bark Skin Upgrade||+1% Bark Skin||1||Alien Ant|
|Chemist Ant Bark Skin Upgrade||+1% Bark Skin||1||Chemist Ant|
|Chemist Ant Bark Skin Upgrade||+0.5% Bark Skin||1||Chemist Ant|
|Engineer Ant Bark Skin Upgrade||+1% Bark Skin||1||Engineer Ant|
|Sage Ant Bark Skin Upgrade||+1% Bark Skin||1||Sage Ant|
|Pig Topiary||+0.5% Bark Skin||1||Topiaries|
|Chicken Topiary||+1% Bark Skin||1||Topiaries|
|Dirty White Cat Plushie||+0.005% Bark Skin per Dirty White Cat||0 to 200||Cat Plushies|
|Himalayan Cat Plushie||+0.015% Bark Skin per Himalayan Cat||0 to 200||Cat Plushies|
|Rainbow Cat Plushie||+0.03% Bark Skin per Rainbow Cat||0 to 200||Cat Plushies|
|Big Cat Statue Upgrade||+1% Bark Skin||1||Big Cat Statue|
|Winter Cat Modifier||+10% Bark Skin (Only when the given Shrine is enabled)||1||Winter Cat Shrine|
Note that for the above sources they are all additive, not multiplicative. For example, if the player already has Bark Skin at 3% and purchase the Chemist Ant Bark Skin Upgrade, they will have a new Bark Skin value of 4%.