
This is partially why Senna doesn't really build attack speed, because her base AS is so abysmal. Senna has the longest auto attack animation in the game at 0.5 seconds at level 1. Note: winding up an auto attack on an enemy champion with mist will extend the timer if the mist is about to decay, so you'll never miss collecting it if you auto attack to pick it up. Senna needs mist in lane or she will begin to fall off, since she is the only champion in the game that does not gain Attack Damage per level, similar to Thresh's inability to gain armor per level. We'll talk about the best ways to farm souls, but it's important to familiarize yourself with the timing on enemy champion between souls. Where the bulk of your souls will come from, though, is from double-tapping enemy champions. Senna will passively get souls in lane while her ADC farms, or off of a heavy leash. Part of her strength is her infinite scaling in her Mist (Souls). Senna does 8.6% less (160% AD) critical damage.

For every 20 stacks, Senna also gains 20 bonus range and 10% critical strike chance.

Lesser minions and lesser monsters that Senna does not kill have a 28% chance to drop a Mist Wraith, otherwise a 10% chance.
