Dr. Boom by MarioToast

Level 1

Gasoline Bombs: Gathering a Regeneration Globe makes your next Bomb Lob deal an additional ~80 damage over 3 seconds to all targets.
Reward: After gathering 20 Regeneration Globes, all Bomb Lobs deal the additional damage.
Flashbang: Cherry Bomb blinds affected enemies for 2 seconds.
Incinerating Block: Every 10 seconds, gain 75 Armor against the next enemy Hero Basic Attack, reducing damage by 75%. Additionally, whenever an attack is blocked by this talent, deal ~50 damage to the attacker. Holds up to 2 charges.

Level 4

Exterminate Vermin: Bomb Lob deals 200% increased damage to non-Heroes.
Demolition Expert: Increases all damage dealt to Structures by 30%.
Miniature Nuke: Quest: Getting a Takedown increases the damage of Rocket Barrage by 10.

Level 7

Brann's Blessing: Now summons 4 Boom Bots, but increases the cooldown by 10 seconds.
Long Lob: Bomb Lob attacks have 1.6 increased range.
Try Again: Whenever Rocket Barrage does not hit any enemies, reduce the cooldown by 5 seconds.

Level 10

Throw Dynamite
Bombpocalypse

Level 13

More Explosions!: Using an Ability resets the cooldown on Bomb Lob.
Concussive Blast: Bomb Lob knocks enemies away from the primary target.
Concentrated Burst: Bomb Lob deals ~120 additional damage, but no longer damages in an area.

Level 16

Executioner
Frenzied Throws: Bomb Lob increases Attack Speed by 70% decaying over 3 seconds.
Poisoned Bombs: Rocket Barrage and Cherry Bombs deals ~80 additional damage over 5 seconds.

Level 20

Double Bundle: Throw Dynamite gets a second charge and explodes 0.25 seconds faster.
Boomaggedon: Summons an additional 5 Boom Bots over the same duration. Whenever Dr. Boom gets a Takedown during Bombpocalypse, reduce the cooldown of Bombpocalypse by 10 seconds.
Bigger Booms: Increase the explosion radius of Rocket Barrage, Bomb Lob, Boom Bot, Cherry Bomb and Throw Dynamite by 35%.
Nexus Frenzy
Bolt of the Storm