This addons allows new recruits and for some units new advace ways:
Lich --> Ancient Lich
Drake Inferno --> Drake Armageddon
Drake Flameheart --> Fire Dragon
Dwarvish Fighter --> Dwarvish Steelclad & Dwarvish Runesmith --> Dwarvish Runemster --> Dwarvish Arcanister
Elvish Fighter --> Elvish Captain & Elvish Hero & Elvish Lord --> Elvish High Lord
Elvish Archer --> Elvish Marksman & Elvish Ranger & Elvish Lord --> Elvish High Lord
Great Mage --> Elder Mage
Wolf --> Great Wolf --> Dire Wolf
Skeleton --> Chocobone & Revenant --> Death Knight & Draug --> Skeletal Dragon
Troll Whelp --> Troll & Troll Shaman & Troll Rocklobber & Troll Hero --> Great Troll
Gryphon Rider --> Gryphon Master & Gryphon
Swordsman --> Royal Warrior & Royal Guard
Pikeman --> Royal Warrior & Halberdier
Tentacle of the Deep --> Cuttlefish & Water Serpent --> Sea Serpent
Walking Corpse --> Souless & Ghoul
Goblin Spearman --> Goblin Impaler & Goblin Rouser & Wolf Rider
Young Ogre --> Ogre --> Yeti.