Massive auto-attack burst during [E]fear and dueling power.
Improved attacks and sustained damage
1.5s after damaging a champion gain a large amount of attack speed. Lethal Tempo allows you to temporarily exceed the attack speed limit.
Takedowns restore health and grant bonus gold.
Takedowns on enemies grant permanent Attack Speed.
Deal 7% more damage to low health champions. Gain AD/AP after kills or assists.
9% attack speed, 10 ability power or 6 attack damage
Gain cooldown reduction and max cooldown reduction on your ultimate. This is increased further each time you use your ultimate, up to a maximum.
While above 70% health, gain up to +40 Ability Power or +28 Attack Damage (based on level), Adaptive.
Lethal Tempo allows you to output a massive amount of damage on a gank after using [R]->[E], allowing you to get in a ton of auto attacks before the fear ends.
Triumph's mid-fight burst heal is great for diving the back-line in in the late-game and continuing onto another target afterward.
More Attack Speed means more damage output/synergy with Lethal Tempo as well as a faster jungle clear.
Coup De Grace's execution play pattern synergizes well with Nocturne's want to execute squishy targets with [R] burst.
More [R]'s means effectively more kills and more opportunities to snowball a game before you get out-scaled for teamfights.
Nocturne's passive is great for keeping you above the health threshold for Absolute Focus granting you a faster jungle clear and more burst damage on your [R] ganks.
Patch 8.10 saw a buff to Phase Rush and jungle duels for scuttle making Xin a powerhouse.