Null Talisman in Dota 2: description, build and who buys it

A small gemstone attached to several chains.

Abilities

• +5 Intelligence
• +2 Strength
• +2 Agility
• +3% max mana percentage
• +1 Mana Regen

Built from

• Circlet
• Mantle of Intelligence

Builds into

All heroes

• Skywrath Mage
• Invoker
• Outworld Destroyer
• Lina
• Visage
• Medusa
• Puck
• Abaddon
• Queen of Pain
• Dark Seer