[Edi]

The new guardian still has an assload of protection so he's fairly durable. I also had the great misfortune in one SP game of running into an AI Ulm that had been massing guardians. I was running a bless based Eriu and encountering him on turn ten or thereabouts with hard research on and the impossible AI getting a 60% resource bonus on top of the 25% Ulm already gets, it wasn't pretty. My army was wiped out in a single battle against a foe they outnumbered two or three to one. And that was his secondary army...