You can send 1 Normal Trap from your hand or that's Set on your field to the GY; Special Summon 1 Level 4 or lower Fiend monster from your Deck in Defense Position, except "Ariane the Labrynth Servant". If another monster(s) leaves the field by your Normal Trap effect (except during the Damage Step): You can draw 1 card, then you can apply this effect.
●From your hand, either Special Summon 1 Fiend monster, or Set 1 Spell/Trap.
You can only use each effect of "Ariane the Labrynth Servant" once per turn.