An armature is the skeleton a sculpted figure is built on: a bendable wire frame, roughly proportioned, that you pose once and then cover with putty. It solves two problems at the same time — the pose is fixed before any material is committed, and the finished figure has a core that stops thin limbs snapping. Working without one on a 25 mm figure means sculpting the pose and the volume simultaneously, which rarely survives a second attempt.
