If you activate a Set "Welcome Labrynth" Normal Trap, you can add this additional effect to that card's effect at resolution.
●Also after that, destroy 1 card on the field.
If you activate a non-"Labrynth" Normal Trap Card (except during the Damage Step): You can Special Summon 1 Fiend monster from your hand or GY. You can only use each effect of "Labrynth Labyrinth" once per turn.