Natural Regeneration (innate skill) - Restores health and mana to nearby units. Also increases armor on upgrade.
Flurry (1) - Based on Cluster Rockets but at medium range. Also increases range, damage and AoE on upgrade.
Awaken the Forest (2) - Summon Treant Warriors and Mages for tanking. Also changes to corrupted variants on upgrade, which deals double damage but has no health regeneration and less armor; and can ressurect once upon death.
Intimidation (3) - Like Howl of Terror but with both damage and armor reduction. Also reduces health and mana regeneration on upgrade.
Burning Ancient (true name concealed) - Based on Robo-Tinker. Greatly increases health, armor and damage at the cost of losing hit points per second. Also replaces Natural Regeneration/Protection with Coruscating Flames (based on Lightning Shield) that deals a lot of DOT to both allies and enemies.
Adaptation (passive skill) - Based on Engineering Upgrade. Upgrades in order after Level 2 - (1) Wave Slashes, (a) Natural Protection, (3) Deadly Echoes, (2) Burning Legion