When a colony of worms contacts contaminated geologists, it can accumulate its own knowledge and summon its master, who will store the experience got by the colony.
+10% to attack, structure and shields of Flaming worms
+9% to shield recovery of Flaming worms and Usurper
+10% of the speed, shields and armour of Usurper
Starting level 10 increases basic speed of Usurper
From level 10 it is possible to build up to 255 Flaming worms.