You can only use the 1st of the following effects of "Therion "Duke" Yul" once per turn.
• You can target 1 "Therion" monster or 1 Psychic monster in your GY; Special Summon this card from your hand, and if you do, equip that monster to this card.
• While you control an Equip Card, "Therion" monsters you control cannot be destroyed by your opponent's card effects.
A "Therion" monster equipped with this card gains 700 ATK, also it gains the 2nd effect listed above as if it were "Therion "Duke" Yul".