Karma

Strengths

Gathering Fire rewards aggressive play. Look to land abilities and basic attacks on your opponent to lower Mantra's cooldown and stay on the offensive.
When using Focused Resolve, slow your opponents with Inner Flame or speed yourself up with Inspire if you're having trouble sticking to a target.
Don't be too conservative with Mantra. Gathering Fire is strongest in teamfights, making it easy to recharge Mantra multiple times.

Passive · Gathering Fire — Karma's damaging abilities will reduce the cooldown of Mantra.
Q · Inner Flame — Karma sends forth a ball of spirit energy that explodes and deals damage upon hitting an enemy unit. Mantra Bonus: In addition to the explosion, Mantra increases the destructive power of her Inner Flame, creating a cataclysm which deals damage after a short delay.
W · Focused Resolve — Karma creates a tether between herself and a targeted enemy, dealing damage and revealing them. If the tether is not broken, the enemy will be rooted and damaged again. Mantra Bonus: Karma strengthens the link, healing herself and extending the root duration.
E · Inspire — Karma summons a protective shield that absorbs incoming damage and increases the Move Speed of the protected ally. Mantra Bonus: Energy radiates out from her target, strengthening the initial shield and applying Inspire to nearby allied champions.
Ultimate · Mantra — Karma empowers her next ability to do an additional effect. Mantra is available at level 1 and does not require a skill point.

A suggested 5-lane lineup built around Karma, based on hero partnerships and role synergy — not win rate.