Forum:A monster's atk or def points would fall below zero

so i have a question. say i have a Dark Lucius lv 4, Earth/fiend 1000 atk 300 def on the field. if i activate a Gaia power all earth monsters gain 500 atk lose 400 def, what would happen to the dark lucius. is it destroyed? or does it have 1500atk, 0 def. or -100 def.