The early game item build of Slark can be the following:
Quelling Blade – This helps Slark to kill easily when creeping for better farming.
Ancient Tango of Essifation – This item helps Slark to regenerate when in mid health condition.
Healing Salve – This item helps Slark to regenerate more fast whenever he is in a low health condition.
Ironwood Branch – This item grants each attributes for Slark giving him more strength and toughness.
Magic Stick – This helps you to counter spell caster enemy heroes.
Stout Shield – This helps you to defend yourself against harassing enemy heroes.
Empty Bottle – This item keeps you to cast spell in constant giving you source of mana and health. Require to play with a courier.
The mid game item build for Slark can be the following:
Power Treads – This boots gives him strength and speed.
Vanguard – This item gives him Health Points and toughness during the game. This item can be maintained until the late game.
Radiance – As a fast farmer game he can easily built this item during the mid game. This item helps him in farming and grants him attack damage.
Mask of Madness – This grants Slark lifesteal and active skill for attack speed improvement.
Maelstrom – This item gives him attack damage and speed plus helps him in killing enemies. This item can be upgraded to Mjollnir.
Hyperstone – This item helps him to do more attack speed. This can be upgraded to Assault Cuirass.
Black King Bar – This helps him to tank and hit more during clash preventing spells to cast on him.
Lothar’s Edge – This can help him to gank, escape and chase enemies.
Kelen’s Dagger – This can help him to gank, escape and chase enemies.
The late game item build for Alcemist can be the following:
Assault Cuirass – This item grants him attack speed and armor.
Basher – This item helps him to stop escaping heroes and grants him damage.
Abyssal Blade – This item is an upgrade for Basher.
Heart of Tarrasque – This grants him massive strength adding more health points.
Divine Rapier – This can be one of the late game item for Slark if your team is near on winning the game.
Butterfly – This item gives Slark more attack speed and grants evasion that counters other melee enemy heroes.