The essence of the tactics when playing as the Dark Elves.

Kaspar is already in the center on day 4, repelling his own artillery and running towards yours. And if you plan to clear the center on the 2nd week, you won't even be allowed in...

What a scary Kaspar :D

Well, I just tried playing as Lethos and went to the center on the 4th day. And I already had Fire Warriors. I defeated the Northern Riders and High Druids on the bridge. And who's going to stop me from getting there? Yes, mana is a problem. If I had an artifact for Knowledge instead of a ring, it would be even better. And by the way, the Necromancer's helmet is not that rare to find at the start. So, I would have 40 mana. And we could easily fight Kaspar.
But why rush there so early? I would rather upgrade my Guild to level 2 and go there on the 6th day with powerful spells and a means to clear Utopia.