I'm here to throw my support for Compouneyes/Snow Cloak.
Mountaineer is an Ability that reflects Syclant's aptitude to protect itself from its rocky habitat.
Syclat instead, stays in a cave/nest/any place it can call home, wich is located in a cold area. Snow Cloak would reflect Syclar capacity to defend itself from predators in it's own habitat, wich is a really cold place. Also, I don't believe Syclar would leave its nest until fully grown up.