Adventure Tomb Gate

Splicing
The tree of this item can be made by mixing the following seeds:
Portcullis Seed Ruined Sign Seed

The Adventure Tomb Gate was added with The Adventure Pack Strikes Back! update. Tomb gates can be used as an automated door that is activated by stepping onto a Tomb Robber and holding Adventure Item - Golden Idol.

Trivia

Unlike other closeable and openable blocks (ex: Dragon Gate), you can plant seeds on this block whether it's shut or opened