No CR limit for the monsters it can spawn.  This makes its CR way greater than 1/8, especially if it can use it infinitely.  It can summon like 3 beholders and can do so again on its next turn.  Generally, this is op for its CR, and just generally op.  Otherwise, I like this idea.  Just needs a few tweaks.        

No, the action says that it spawns 1d4 Abberant Monsters. While you can tweak this to summon those. While I understand it can be pretty overpowered summoning like 4 Abberant Monsters both casting Eldritch blast at a lvl 2-3 party I can see how this can be broken. Although their lower health can overcome by a high initiative party, like 3 rouges and a cleric. 

Quote from ArathorWarpick >>

No, the action says that it spawns 1d4 Abberant Monsters. While you can tweak this to summon those. While I understand it can be pretty overpowered summoning like 4 Abberant Monsters both casting Eldritch blast at a lvl 2-3 party I can see how this can be broken. Although their lower health can overcome by a high initiative party, like 3 rouges and a cleric. 

 Oh.  So it means it summons clones of itself.  That's it.  I thought it meant it can spawn any monster with the Aberration type.      

Hey, its ok I probobly should have made that more specific. 

This is actually one of the most f'ed up monsters I've ever made. ._.

I am officially concerned.

What else have you made?