Orc

1. 2

   All allies gain +100 max HP.

2. 4

   All allies gain another +400 max HP (+500 total).

3. 6

   All allies gain +10 max HP for every point of HP your courier has lost, up to +800.

   Note: The tooltip doesn't mention the +800 HP cap.

Official in-game tooltip

SPECIES TRAIT: Battle Hardened
Active when you have at least (N) different pieces of this species on board. (Multiple effects stack)

(2) Orcs: All allies have +100 Health.
(4) Orcs: All allies have +400 Health.
(6) Orcs: All allies have +10x(Courier health lost) Health.

The Orcs are a prolific and physically powerful race, excellent at tolerating pain and injury. Being exotic to Drodolands, their home was a once-lush world but now a shattered realm. They abandoned their peaceful culture when the demon lord cunningly corrupted the Orcs and used them in his vengeful plot against the his own people.

Often paired with

Races and classes that Orc pieces also have, with how many share each.

Shaman 2Warrior 2Hunter 1Priest 1Warlock 1