The Egg isn't so bad in certain battles. I "had" to choose the 100 % leadeship, since the other upgrades weren't useful. And immediately I put it into use: It can't be wise to face Thomas Thorkves 2 X 50 Paladins with my 25, especially as Thorkve casts God Armour on them repeatedly. Instead I laid 2 eggs and killed Inquisitors first. The eggs gave me Royal Griffins and Hayterants (I guess I was lucky, too) which I used to stop the Paladins. Then I started using Balls of Lightning
and ranged fire on the Paladins. I used Nature's Call, too and Pain Mirror. But still the encounter took a long time; clearly it would have been unwise to let the paladins come near my units.