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Toughness reduces damage from player characters; the higher your level, the more toughness is required.
To reduce incoming player damage by 1% requires 15 Toughness at Level 1 and 71 Toughness at Level 30.

All roles require this stat in PvP content.

Toughness is an important stat for Tanks in PvP content.

The Iconic power Nanoweave Armor increases Toughness by 200.
600 Toughness is available in Weapon trees.

Other stats:

Hidden Stats: