Adamantine Dragon 3
Brass Dragon 20 + 1 = 21
Bronze Dragon 21
Cobalt Dragon 21
Copper Dragon 20
Electrum Dragon 10
Gold Dragon 20
Mercury Dragon 19
Mithral Dragon 13
Orium Dragon 2 - 2 = 0
Silver Dragon 22
Steel Dragon 19
Then again, my DL group also met a brass dragon with an excellent backstory of being frozen in time by the dark wizard Fistandantilus... And I had no clue what Orium was, so that's -2.