Builder

Builder is a Dwarf class that builds.

Builder is the class that constructs the walls and roof of the Keep. The Keep, or dwarven fortress, is made up of an area of auto-walls. As builder, you can fly around and place blocks in this range to create the base. In order to efficiently place the blocks for auto wall, make sure that it is at least one block outside the ground level stonebrick blocks. Each block you place will spawn a 3x3x3 cube of stonebrick. This occurs both on the roof and on the walls, however it will not take place if it is attempted within the inside of the Keep as mentioned before.

In order to obtain Builder's tokens, simply do your job of creating the fortress. The Builder's tokens are useful for summoning stonebrick stairs, glowstone, summoning lapis, or rerolling class. Both stonebrick and glowstone cost 6 tokens, rerolling class costs 20, and summoning lapis will only cost one token for a set of 4 lapis. Builder is the only class that may reroll, and people oftentimes make use of this opportunity.

NOTE: It is also highly advised that you surround the shrine (Area with enchant tables and emerald pillars) with an inner wall and roof. This provides a fallback layer of defense for the dwarves and a safe-haven to teleport to when in danger.

tl;dr:

Build the walls and roof of the keep. Autowalls will make a 3x3x3 area around where you place as long as it is in the wall and roof area. Builder's tokens can be used to summon lapis, stonebrick stairs, glowstone, or reroll class. It is advised that you create an internal wall around the shrine.