Stronghold/Structure

Stronghold
Strongholds are structures that occur naturally underground, and are primarily important because they house end portals. Strongholds can be located using eyes of ender. Note that any of the stone bricks in the blueprints below can be mossy stone brick, cracked stone brick, or any of their monster egg variants.

Four-Entrance Room With Staircase
Work in progress!!

Loot Altar
Work in progress!!