Level 1:

Regeneration Master: Picking up health globes permanently increases health regeneration by 1.5 per second.

Mighty Oak: Increase the length of War Club by 20%.

Splinter: Increase the width of War Club by 50%. This extra area deals 25% of War Club's damage.

Boast: Increase the radius of Taunt by 25%.

Level 4:

Gift Of The Earth: Picking up Health Globes causes Baron Kazum to receive the benefit of 2 Health Globes.

Timber: Takedowns increase the damage of War Club by 1%, up to 10%. This bonus is lost upon dying.

Intimidate: Enemy minions and mercenaries hit by Taunt deal 100% less damage for 4 seconds.

A Walk In The Woods: You move 10% faster while Momentum is on cooldown.

Level 7:

Battle Momentum: Basic attacks reduce ability cooldowns by 0.5 seconds.

Rolling Stone: Increase your movement speed by 20% when you haven't been damaged for 4 seconds.

Inspire: Taunt increases all regeneration effects by 200% and healing received by 25% for 4 seconds.

Frenzy: Momentum increases your attack speed by the same amount.

Level 10:

Landslide: Crumble to dust over 3 seconds, reforming from the earth simultaneously at any visible location within range (has about the same range as Illidan's Hunt). Damage can only be dealt to the crumbling copy of Baron Kazum while Landslide is being cast. Cannot be canceled. 70 second cooldown.

Titan's Grip: Permanently equip a second War Club, increasing the damage of your basic attacks by 35% and causing War Club to strike in two parallel lines.

Level 13:

Unshakeable: Basic attacks against you deal reduced damage equal to 1.5% of your maximum health.

Pulverize: If War Club hits only 1 target it deals 35% more damage.

Angry Giant: If War Club hits no targets its cooldown is reduced by 50%. This cannot occur twice in a row.

Impetus: Increase the damage of your basic attacks by 50% during Momentum and they extend the duration of Momentum by 0.5 seconds. This extended duration does not increase your movement speed further.

Level 16:

Imposing Presence: Enemies that attack you have their attack speed slowed by 40%.

Petrify: Enemies within Taunt's radius are slowed by 40%, decaying over 4 seconds.

Rockhide: Gain a shield equal to 10% of your health for each enemy hero affected by Taunt. Lasts 4 seconds.

The Baron Special: War Club has no delay before striking when used during Momentum.

Level 20:

Return To The Earth: Reduce the cooldown of Landslide by 20 seconds and heal for 30% of your health while Landslide is being cast.

Titan's Swing: War Club can be cast once more immediately for 2 seconds. This free cast instead causes Baron Kazun to swing his War Clubs in an arc in front of himself, gathering all enemies hit together and stunning them for 1 second when his War Clubs collide.

The Mountain Giant: Inertia causes you to be permanently unstoppable.