Precast Dark Pact before disables land, the 1.5 second delay means queuing it lets the pulses fire and purge the stun mid duration.

Pounce travels in the direction Slark is facing, not toward the cursor, so know which way you are pointed before jumping.

Slark peaks in the mid game around 20 to 30 minutes with Diffusal and Skadi, but permanent Essence Shift stacks keep him scaling late.

After 30 to 40 minutes of fighting a good Slark has 30 to 50 permanent agility, giving massive attack speed and armor.

Shadow Dance active cannot be revealed by Dust, Sentries or Gem, so use it to escape and regenerate safely.

Aghanim's Scepter gives Pounce two charges with lower cooldown, hugely increasing your pick off potential.

Essence Shift slow stacks with the stat steal, making it nearly impossible for enemies to trade with you after level 2 or 3.