Thorns deal a percentage of an enemy's max health as damage when they hit your tower (50% damage to Boss). This also includes ranged attackers.
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If you have a Wall, you will also need to take into your Wall Thorns to calculate the amount of enemy hits taken until an enemy dies. You may also refer to Infographic: Wall Thorns Max Hits with Plasma Cannon Mastery & Thorn Relic.
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| âŖ | Type | Common | Rare | Epic | Legendary | Mythic | Ancestral |
|---|---|---|---|---|---|---|---|
| Thorns substat | âŖ | n/a | n/a | 2% | 4% | 7% | 10% |
https://the-tower-idle-tower-defense.fandom.com/wiki/Thorn_Damage#Description