Tactics for Rampart.

If the victim were to take action, the vulnerability to explosion would be compensated by the ability to resurrect them. But as it is, this is a major disadvantage for them.

By the way, the immunity of golden dragons is generally useless (the only advantage is if you manage to get Armageddon).

It also protects against berserkers, and they cannot be slowed down or blinded.

Since they are vulnerable to explosion, they can be defeated in one turn.

If you take Thorgrim and place dragons near the unicorns, you get a large amount of resistance.

And by the way, by the time you upgrade them, a lot of time will have passed; it's easier to find a Fortress on a hill.

I agree - they are similar to Black Dragons in this regard.
After building 3 levels of the Guild, there is a temptation to build the 4th level instead of upgrading the dragons.