The Claim is a construct placed over a Spring, at which you provide an offering to spawn a new Dwarf. This is the only method of producing dwarves reliably, and has been done as a ritual ever since the First Age.
The Claim is crafted by an engineer by Hand.
The Claim requires 5 Stone and 5 Wood to craft.
The Claim is unlocked by default, and requires no technology.
The standard offering for Dwarves is 1 portion of Food and 1 Gem. A portions of food equates to 4 Mushrooms, 2 Fish or 1 Bunny Meat. There are 3 offering recipes for the 3 food types. Note: For the current build, these recipes are found in the Engineer's Crafting Instructions.