Back Attack

Increases Damage when successfully attacking from behind.
Ignores target's Block when attacking from behind.

No skills apply it.

Used by

Skills that get a bonus from it, or need it. A tag names what must come first, such as a skill level.

Active skills (1)
- Ambush
  - Increases damage by 30% on landing as a Back attack.
  - Skill level 8: Engraves 2 Insignias for 10s on landing as a Back attack
Stigma skills (3)
- Triniel's Dagger
  - Increases damage by 30% if attacking from behind the target.
  - Skill level 25 (not on Global yet): +10% Back Attack Damage Boost for 5s on hit
- Illusive Clone
  - Skill level 25 (not on Global yet): -1s [Illusive Clone] cooldown on Back Critical for the duration
- Shadow Walk
  - Skill level 25 (not on Global yet): Stun for 3s on Back Attack while in Stealth
Passive skills (1)
- Rear Smite
  - Increases the caster's Back Attack Damage Boost by 18.5%, PvE Damage Boost by 18.5%, and PvP Damage Boost by 9.25%.

Does a hit from behind deal more damage on its own?

Not by itself. Back Attack, Back Attack Damage Boost and Back Attack Critical Hit add to hits from behind. Without these, or a skill line about it, a hit from behind deals the same as an unblocked front hit.
Which stat lowers the damage I take from behind?

Back Defense and Back Attack Damage Tolerance. Both cut the damage of hits that land on you from behind, and only those. Your normal Defense and Damage Tolerance work on hits from every side.