Mekansm in Dota 2: description, build and who buys it

A glowing jewel formed out of assorted parts that somehow fit together perfectly.

Abilities

• +5 Armor
• Active: Restore. Restores 250 health to allied units in a 1200 radius.
• Passive: Mekansm Aura. Grants 2.5 health regeneration to allied units in a 1200 radius.

Built from

• Headdress
• Chainmail

Builds into

• Guardian Greaves

All heroes

• Chen
• Io
• Dazzle
• Storm Spirit
• Venomancer
• Oracle
• Death Prophet
• Jakiro
• Mirana
• Techies