To get the 8 Cobalt Crawlers easily, use the invoke 1:86 code to enable cheat
mode and select to "Choose Map" at the cheat menu. Select "Democratus Surface", 
then "Ballotine/Doren/Whitendon" in that order to go the Whitendon map. Once 
there, open the console window and type invoke 87:3035. There will be a dialogue
-- click through it, and receive a cobalt crawler. Repeat it another seven times
to get the eight needed to assemble Hecatomb, the game's most powerful Mystech. 
Note: This is only useful once you have passed the Elementor introduction by 
Grumpos in Hephaestus.