You secure the MATRIORB through your CHASTITY MODUS. Safe and sound!

You will serendipitously discover the key to unlock this card when and only when you are ready to use this item, and not a moment before!

So, the Matriorb comes from the virgin mother grub, and is stored in the chastity modus. Subtle as an anvil, there.

And the matriorb is covered in what seems to be troll horns.