Saibamen are an enemy from the dragon block C mod. They could be the first enemies you encounter.

They have their own monster spawner that looks like sunken in light dirt. If not spawned by the story mission, they are naturally found in the Dirty Stony biome.

Usually have to Beat X amount to advance the plot.

Older version:

used to drop Ki orbs to craft attacks.

Used to drop items to advance quests.