Goblin Sappers by TimeLord

Lvl 1:
Mega Explosion (Q): Quest: Hit 30 Heroes with Cluster Rockets. Reward: Increases the area of effect by 20%.
Always Bring Spares (W): Quest: Kill 30 Minions with Explosive Barrel. Reward: Explosive Barrel now has 2 charges.
Resourceful: Regen globes grant 50% more Health and Mana. Quest: Collect 20 globes to increase max Health of Sappers by 10%.

Lvl 4:
Teamwork (D): When close together, Sappers have 10 Physical Armor.
Individual Training (D): When separated, basic attack damage of each Sapper is increased by 20%.
Runners (Z): Reduce the cooldown of Sappers' Rush by 10 seconds.

Lvl 7:
Cost-Effective (Q): Hitting at least 4 enemies with Cluster Rockets refunds half of its Mana cost and reduces its cooldown by 3 seconds.
Concussion (W): Explosive Barrel explosion slows enemies by 25% for 3 seconds.
Malfunction: Your basic attacks destroy 1 Ammo.

Lvl 13:
Group Safety (D): When close together, Sappers gain 10 Spell Armor.
Fast Shooters (D): When separated, Sappers gain 15% increased attack speed.
Secret Tactic (E): If cast on a slowed, rooted or stunned enemy, Kaboom's area of effect is increased by 30%.

Lvl 16:
Improved Missiles (Q): Damage of Cluster Rockets increases by 10% every 0.5 seconds.
That's Not All! (W): Explosive Barrel explodes a second time after 1.5 seconds.
Back in Business (E): If Kaboom! kills an enemy Hero, the Sapper that died respawns after 3 seconds.

Lvl 20:
Goblin Factory (R1): Basic Attacks reduce the cooldown of all of your abilities by 1 second.
Strong Winds (R2): The Zeppelin explodes after 3 seconds and has 30% increased Health.
Short Fuse (W): Explosive Barrel now explodes immediately after casting, dealing 15% increased damage.
Next-Level Tech (Active): If one Sapper dies, the other can channel for 4 seconds to revive it.