Siege Block

The siege block is an attack block that can be placed in enemy territory during raiding hours. After four seconds of being placed, it will turn into a nether brick block, allowing attackers to build bridges and staircases, with the caveat that it takes time to build and costs resources.

Gravity
Siege blocks are subject to the same gravity rules as all other blocks. This means to build a long bridge you’ll need to build 3 out then build 1 up then 3 out again, etc. Siege blocks have an additional rule in that they can only be placed on top of another block OR against a nether brick block, i.e. they cannot be built in the air against say a stone wall to make a really fast staircase.

Notification
Defending players receive a directional message about a siege block being placed in their territory.