What's the adjective for rampancy? Here's the word you're looking for.
Included below are past participle and present participle forms for the
verbs rampage and rampauge which may be used as adjectives within certain contexts.
rampant
(originally)Rearing on both hind legs with the forelegs extended.
(heraldry)Rearing up, especially on its hindleg(s), with a foreleg raised and in profile.