Deal damage equal to your thorns when struck. Then remove those thorns at turn end.

Mechanics

When the player is struck, damage is dealt equal to the current number of Thorns stacks.
Thorns are only removed at the end of the turn if they have been triggered.
If the enemy is stunned or otherwise skips their strike, Thorns remain into the next round.

Thorns is part of the Status effect tags.

Items

Item	Rarity	Stats	Effect	Region
Horned Helmet	Common	2 / 4 / 8	Battle Start: Gain 1 stack of thorns — at Gold: 2 , at Diamond: 4	Woodland
Spiny Chestnut	Common	-	Battle Start: Gain 3 thorns — at Gold: 6 , at Diamond: 12	Woodland
Blackbriar Gauntlet	Rare	-	Gain 2 thorns for each armor removed by the enemy's first strike	Woodland
Blackbriar Rose	Rare	-	Whenever you restore health, gain 2 thorns. You can only equip 1 rose	Woodland
Bramble Belt	Rare	-	Battle Start: Gain 1 thorns and give the enemy 1 additional strike	Woodland
Bramble Buckler	Rare	2	Turn Start: Spend 1 armor to gain 2 thorns	Woodland
Bramble Talisman	Rare	-	Whenever you gain thorns, gain 1 armor	Woodland
Bramble Vest	Rare	3	The first time you lose thorns, restore health equal to thorns lost	Woodland
Ice Spikes	Rare	-	Turn Start: If you have freeze, gain 5 thorns	Woodland
Pinecone Breastplate	Rare	-	Battle Start: If your health is full, gain 1 thorn whenever the enemy strikes you the rest of battle	Woodland
Thorn Ring	Rare	-	Battle Start: Take 5 damage and gain 10 thorns	Woodland
Blackbriar Armor	Heroic	-1	Whenever you lose armor, gain 2 thorns	Woodland
Cactus Cap	Rare	-	If the enemy has no armor, thorns deal double damage	Woodland
Razor Breastplate	Heroic	3	Wounded: Gain thorns equal to enemy attack	Woodland
Granite Thorns	Mythic	-	You don't lose any thorns on the enemy's first 3 strikes	Woodland