Slark Build

Preferred Build
1 - Pounce
2 - Dark Pact
3 - Essence Shift
4 - Pounce
5 - Pounce
6 - Shadow Dance
7 - Pounce
8 - Essence Shift
9 - Stats
10 - Stats
11 - Shadow Dance
12 - Stats
13 - Essence Shift
14 - Stats
15 - Essence Shift
16 - Shadow Dance
17 - Stats
18 - Stats
19 - Stats
20 - Stats
21 - Stats
22 - Stats
23 - Dark Pact/None
24 - Dark Pact/None
25 - Dark Pact/None

Normal Build
1-Pounce/Essence
2-Essence/Pounce
3-Dark Pact
4-Dark Pact
5-Dark Pact
6-Shadow Dance
7-Dark Pact
8-Pounce
9-Pounce
10-Pounce
11-Shadow Dance
12-Essence Shift
13-Essence Shift
14-Essence Shift
15-Stats
16-Shadow Dance
17-Stats
18-Stats
19-Stats
20-Stats
21-Stats
22-Stats
23-Stats
24-Stats
25-Stats

Early Game
Just Focus on last hitting/denying and getting to level 6 ASAP. You can attempt first blood if you have a disabler with you and if you skilled pounce first. Aim to be able to buy Boots and Orb of Venom by level 6.

Midgame
By level 6 and up, try ganking heroes with no disables or blink. As long as your teammate reacts quickly and you land your pounce properly, you are sure to kill the enemy.

Late Game
By now you have Skadi and BKB, know when it's safe to rush into the battle, turn on BKB and start stealing stats. It's not uncommon for triple kills at this stage of the game.