The Heart of Tarrasque is a powerful, semi-realistic fantasy artifact resembling a pulsating, oversized heart with a dark, fleshy exterior. It features intricate vein-like patterns that glow faintly with a deep red hue, suggesting its immense vitality. The surface is slightly rough and organic, with a subtle, rhythmic pulsation effect to emphasize its living nature, encased in a metallic, ornate frame that hints at its legendary status.