Weaver

Consider placing an observer for midlaner quickly with Shukuchi as you load into the game.

Sniping couriers with the help of a ward behind their tier 1 tower will reduce their available detection.

Keep checking opponents' inventory for detection.

Use Shukuchi to secure ranged creep and damage the opponents at the same time.

In fights, focus on applying Swarm on as many opponents as possible and prioritize killing supports and backliners first.

When not much is happening, push out the sidelines aggressively as Weaver is elusive.

Weaver enables the team to take Roshan fairly early due to Swarm armor reduction.

Aghanim's Scepter is a game-changing pick up. In pair with Blink Dagger or Aether Lens, it becomes easier to use.

Bring a sentry and extra consumables to the lane against Weaver.

Remove The Swarm from yourself and from teammates or you will loose a lot of armor.

Weaver's Time Lapse will remove Dust of Appearance.

Weaver is really good at killing supports and backliners. Protect them.

Becoming invisible removes The Swarm unless you are being detected or Weaver has Shard upgrade.

Instant disables and silences are great against the elusive Weaver.

Armor items, Heaven's Halberd and Ghost Scepter are great against Weaver's physical damage.