Orcs – discussion about the race.

Cyclops are difficult to kill, of course, but it is possible to develop any race without losses, it is not necessary to fight with the highest-level units:

Warlocks - with Furies, against archers - with Harpies, no losses
High Elves - using the symbiosis of Nymphs and Ents, + archers with initiative and strength - no losses
Mages - Razazak, Golems, Gremlins - minimal losses

And so on, but the huge losses in growth when building Cyclops at the expense of the Castle and Stronghold are obvious.