Scrap and Equalize
Arcane Comet
Damaging a champion with an ability hurls a comet at their location, or, if Arcane Comet is on cooldown, reduces its remaining cooldown.
Adaptive Damage : 30 - 130 based on level (+0.05 AP and+0.1 bonus AD )
Cooldown: 20 - 8s
Cooldown Reduction:
Single Target: 20%.
Area of Effect: 10%.
Damage over Time: 5%.Why?
Proccing Comet on Rumble with either **[E] or [R] is likely to result in a hit** thanks to the slow. If opting for Rylai's [Q] should become reliable as well. Thanks to Rumble's mana-less, try to abuse Comet by landing as many abilities as possible while it's on cooldown.
Axiom Arcanist
Your Ultimate has 12% increased damage, healing, and shielding.
(AoE damage is reduced to a 8% increase)
Scoring a takedown on an enemy champion reduces your Ultimate's current cooldown by 7%.Why?
Nullifying Orb allows you to trade aggressively into AP matchups where you might otherwise risk dying.
Transcendence
Gain bonuses upon reaching the following levels:
Level 5: +5Ability Haste
Level 8: +5Ability Haste
Level 11: On Champion takedown, reduce the remaining cooldown of basic abilities by 20%.Why?
Transcendence on Rumble allows you to opt for a heavily Magic Penetration focused build while still being able to keep your teamfight damage up with a little bit of CDR.
Scorch
Your next damaging ability hit sets champions on fire dealing 20 - 40 bonus magic damage based on level after 1s.
Cooldown: 10sWhy?
Scorch is rune that is **heavily abusable in lane** by Rumble with [Q]. The **damage scales** decently on him as well since he likes to **stack Magic Penetration** early. If you think the game is going to get stalled out into 30-40mins+ take Gathering Storm instead.
Ghost Poro
When your wards expire, they leave behind a Ghost Poro, which grants vision for 90s. Nearby enemy champions scare the Ghost Poro away.
Gain anadaptive bonus of 1.2 Attack Damage or 2 Ability Power for every Ghost Poro spawned and when your Ghost Poro spots an enemy champion up to 10 stacks.
After gaining 10 stacks, additionally gain 10 adaptive force.Why?
Ghost Poro is especially useful on Rumble as the added vision grants you lane safety for when you are pushing. The extra AP when pushed is also great for granting you kill pressure.
Treasure Hunter
Gain an additional
50 gold the next time you collect a Bounty Hunter stack. Increase the gold gained by20 gold for each Bounty Hunter stack, up to130 gold .
Bounty Hunter stacks are earned the first time you get a takedown on each enemy champion.Why?
Ravenous Hunter allows you to lane aggressively and pseudo frontline with [Q] granting considerable healing.
