Originally posted by Alio:

3 major building/workbench pieces need to all be within 20-40m range of each other in order to trigger a raid.

The type of raid depends on what bosses have been defeated on the world.

its only been like 4 days since i bought the game, killed 2 bosses and farmed ogres for ogre armor upgrades and stuck at bronze

my workstations at lvl 4 as highest, trying to reach the swamp once ive finished ny new base so just because ive killed the 2nd boss then i will get raids from the swamp ?