The shortest way through

[McSwan]

debir->scarlet->bolo to get repair bots, then everything else becomes a fair chuck easier.

I managed to do the debir -> scarlet -> rusty -> verona -> monterro run with a single green dragon, but it was very (rediculously) hard, probably too hard as you have to do a fair amount of running around killing creeps in order.

Level 3 order + heal and guardian angel is what got me through, but yeah, warrior + repair bot is a winner.