2 Level 4 monsters
For this card's Xyz Summon, you can treat Rank 4 monsters you control as Level 4 monsters for material. You can detach 1 material from this card; this card can make up to 2 attacks on monsters during each Battle Phase this turn. If this card is sent to the GY: You can target 2 other Rank 4 or lower Xyz Monsters in your GY; Special Summon 1 of them and attach the other to it as material. You can only use this effect of "Eclipse Twins" once per turn.