Alright, finished editing the Gargoyle. I've done pretty much just what Gorgondantess told me to, but I have two notes to add:

Horrendous Visage allows lower fear effects because sometimes it really doesn't help when your foe runs away rather than fighting at reduced efficiency for a round or two more.

Stone Cold Metabolism shall stay as it is, because it offers some clarification as to ongoing effects which affect only creatures or only objects, and because it gives exactly what you're immune to in said form (there are probably things that might be argued otherwise). Plus it took ages to write and already says you count as an object up front, the rest is just durations and clarifying not-impossible but rare circumstances.