Deep in the bowels of the foreboding castle, steeped in the murk and the dust of centuries, lies The Nodoratory. Amidst the sparking Tesla coils, the warped glass beakers bubbling with unknown reagents and the billowing noxious vapors, E2's mad scientists labor long into the night. Sometimes they produce marvels, nodes of wondrous beauty or dark nodes that hold grim fascination. But amidst the complex spells and cries of supplication to the muses, sometimes an accident of fate creates the bane of all noders, the dread Node of Experience Draining. Such nodes appear quietly in the noder's collection of nodes, unseen by their creator, siphoning off XP into some dark, negative universe for foul purposes best unguessed at.
Or so I suspect.