You cannot Pendulum Summon monsters, except "Magician", "Odd-Eyes", and "Supreme King" Pendulum Monsters. This effect cannot be negated. Once per turn, if an "Odd-Eyes" Pendulum Monster(s) you control is destroyed while you control no other monsters: You can add 1 Pendulum Monster Tuner, 1 "Polymerization" Spell, or 1 "Fusion" Spell from your Deck to your hand.
If you control no other monsters: You can Tribute this card, then target 1 Pendulum Monster, that is in your GY or face-up in your Extra Deck; Special Summon it, ignoring its Summoning conditions, also you cannot Special Summon monsters from the Extra Deck for the rest of this turn. You can only use this effect of "Dark King Magician" once per turn.