Ankylosaurus.  Aka, living siege engine.  Well, ok, technically it's a modified saichania (as there wasn't a full ankylosaurus skeleton for Johann to work from), but only a paleontologist would be able to make that distinction.
Either way, it's a massive herbivore with enough of a club to break the bones of a marauding t-rex, and enough armor to (in theory) stop light anti-tank weaponry.  Not that Johann has *tested* this theory, mind you... but it ought to work.


-1 echoes of the beast (+1 endurance vs. heat / fire / arid conditions)
-1 claws
-2 hulking size
-4 supernatural strength
-4 supernatural toughness
+3 catch
-1 armor plated (use endurance to defend against physically damaging attacks & maneuvers)

(unspent: +1)
+6: fists, endurance
+5: alertness, might
+4: lore, investigation
+3: presence, conviction, athletics
+2: discipline, survival, scholarship, empathy
+1: rapport, deceit, performance, stealth

details on individual forms:
Johann only has one each male and female forms for the moment, both in polished nearly mirror-white colors.
He's got plans for a camouflaged sandstone brown, but hasn't quite gotten the pigmentation right yet.  (Read: doesn't have the refresh available to pay for a stunt to buy off the hulking size stealth penalty.)