Way of Light
Lifeground - Tall grass heals you for 1 heart every 3 seconds.
The most effective passive heal in GCM2 goes to the Preserver with Lifeground. Remember that being stuck in tall grass isn't such a bad thing. Melee classes and even thieves are less effective in rough terrain. Use it to your advantage; stake out an area to defend with some tall grass in it and stand your ground.
Leads to: Diviner or Vicar