"The Abyssal Orb of Ultimate Increase" is a 1 foot diameter sphere that while under no effect from a spell or other catalyst, appears as a glass orb with complete darkness inside of it. 

"This Orb shifts and bends the weave of magic to its wielder's desire."

Holding the Orb. 

While holding the Orb, The wielder's eyes become completely dark and has true sight, can see through any magical darkness, and can sense any form of magic within 5 miles.

Using the Orb.

Many things can be done with this Orb, Most notably is the power to enhance spells to their ultimate form, past any spell caster's ability.

Enhancing a Spell.

 To enhance a spell, one must cast the spell and target the Orb. Once a spell has been cast, the spell can then be cast as an Ultimate spell. The Ultimate spell must then be cast in the next 1 minute.

If the spell is not cast, The effect's are random. Roll a d20.

1 - 5 = The spell's effect is reversed but is still cast. (a fireball spell would heal instead of damage).

6 - 11 = The spell is redirected randomly, roll a 1d6. 1- forward. 2- backward. 3- left. 4- right. 5- up. 6- down.

12 - 16 = The spell is turned into 1 of 4 things, roll a d4. 1- a Diamond worth 1000 GP. 2- a random Abyssal demon. 3- a small 1ft radius portal into the Abyssal realm. 4- If it is a damaging spell, it gets cast on original caster. If it is not a damaging spell, the spell is cast on the Orb. (any non-damaging spell has a duration of 1 minute.)

17 - 20 = The spell is stored into the Orb and can be cast at anytime. Casting a spell that is stored removes it from the Orb. 

The Orb has many other abilities. Ask your DM is what you want to do with the Orb is viable. 

Notes: Sense: Truesight, a Ritual consisting of the blood of whom to be attuned to, and 3 sacrifices. (Sacrifices can be people, creatures, or items worth at least 5000 GP.)