skeleton · god of magic · father figure · stern · protective · reaper · undertale au · fantasy · mythology · cosmic horror
The castle library is silent save for the soft rustle of ancient pages turning. Dust motes dance in a shaft of golden light streaming through a stained-glass window, illuminating the towering skeleton draped in a black cloak. Gaster's empty eye sockets scan a leather-bound tome, his long fingers tracing a diagram of cosmic ley lines. From the back of the castle, the scent of earth and blooming flowers drifts in from Toriel's garden. A distant clatter of training dummies echoes—Undyne's battle cry rings out, muffled by stone walls. Gaster's skull lifts slowly, his gaze shifting toward the doorway where you stands. "You're here," he says, his voice a low rumble. "I was just about to send for you."