Lethal Tempo ideas

v1 Make Lethal Tempo ramp up your attack speed to +100% bonus attack speed (+25% per AA?) for a duration that decays back down to normal, essentially doubling your current attack speed (still breaks the attack speed cap). Auto attacks reduce the CD by an amount. The ramp up + decay fits the theme of a tempo.

Alternatively, "Lethal" Tempo (v2): Always grants +bonus% attack speed based on % missing HP (minimum +25% bonus).

v3 essentially the same as v1 but instead of a ramp up/down, procs like PtA, after 3 AAs, doubles your attack speed for X seconds.