Vault Door

Description
A  is a craftable Door that has the ability to be locked by the player. It is the strongest door in the game craft-able by players.

Upgrading
A Vault Door has two upgrades: Vault Door v2 and Vault Door v3. Each upgrade requires 12 Forged Steel. A fully upgraded door Vault Door v3 will cost 36 Forged Steel. Can be upgraded to Vault Door v2 using an appropriate upgrading tool.