That is not bad idea at all.
I have a small idea for old big Warg Sentry. Maybe Sharku can summon this building on level 10. If I know, all the others factions can summon a defense buildings:
Rohan: Theodred's tower
Mordor: Barricade
Gondor and Arnor: Lone tower
Dwarves: Lone tower and Citadel
This is a good idea, I find the Indomitable Warg to be useless and weak (just like Sharku, Ha!) having a summonable Warg Sentry would be cool, but it belongs in its own idea thread.Ok, I will start new thread. ;)