You can target 1 Level 5 or higher Fiend monster in your GY; discard 1 Fiend monster, and if you do, Special Summon the targeted monster. You can only use this effect of "Call of the Archfiend" once per turn.
Can discard any Fiend-type monster to Special Summon 1 level 5 or higher Fiend-type monster from your Graveyard.
Continuous Trap card may clog your Field.
Being able to Special Summon high level Fiend-type monsters gives you a huge firepower advantage on the Field.
If you are using Archfiend Emperor, The First Lord of Horror, you can discard a lower level “Archfiend” monster to Special Summon Archfiend Emperor, The First Lord of Horror, and banish that “Archfiend” monster in order for Archfiend Emperor to destroy 1 card on the Field.
If you are playing other Archfiend monsters like Imprisoned Queen Archfiend, it is suggested you have Pandemonium Field Spell ready to avoid Life Point cost.