Recommended army before Rezo battle

[gogolmax]

Hi

I'm a warrior on Level 45 cleaning up Arlania just before fighting rezo.
My problem is that human units are getting rare (Eric blocks the Greenwort castle). Any recommendations which units I should choose to go on?

I have a couple of deadly / invincible units to fight before fighting renzo - mainly the ones on the beach and on Griffin Island. As soon as I fight renzo hostile armies turn into friendly / neutral armies and I guess I should fight them before to boost my level.

Any hints? Thanks a lot!