You can only use the 1st and 2nd effect of this card’s name each once per turn.
(1) During your Main Phase: You can discard 1 “Dark World” monster, and if you do, all “Dark World” monsters you currently control gain ATK equal to the discarded monster’s Level x 100 until the end of this turn.
(2) If your monster(s) whose original Type is Fiend is discarded by the effect of a “Dark World” card or an opponent’s card (even during the Damage Step): You can discard 1 card, then draw 2 cards.