Arto's Sphere of Monster Control

This magic item takes the shape of a small hand held sphere with a variety of colors determined by its rarity. The sphere all have a small hidden mechanism somewhere on it.

This magical sphere can be used as an improvised weapon with a +1 to hit.

On a hit, if the target's original creature type is one of the follow: "Beast, Construct, Dragon, Giant, Monstrosity, Elemental, Plant, Ooze or Aberration", you can forgo the damage and attempt to ensnare the creature in this sphere's magic. The creature must succeed on a saving throw of its choice against a save DC specified by the Sphere, if the creature is immune to the Charmed condition, it is gains advantage on its saving throw. (a creature has disadvantage on this save if its hit point is less than a half of its maximum hit point. And suffer a -5 penalty to its save if its hit point is less than a one tenth of its maximum hit points)

You can only ensnare a creature if the creature's CR is lower than the CR of the Sphere.

Rarity	Description	CR	Save DC
Uncommon	A Red Sphere	1	12
Rare	A Blue Sphere	4	15
Very Rare	A Yellow Sphere	8	18
Legendary	A Black Sphere	16	22
Artifact	A Purple Sphere	30	25

 

If a creature fail's its saving throw against the sphere's save DC, it is captured and charmed by the sphere.
(A creature immune to charmed, lose its immunity if it is captured by the sphere.) 

As an action, you may press a hidden mechanism on the sphere and summon the captured creature anywhere within 15ft of you. The creature is obedient to you and will follow any command in reason. After 1 minute, the creature disappear returning into the sphere.

(If the creature's hit points is reduced to 0 while outside of the sphere, it immediately returns to the sphere and the sphere fade's into a pale gray color. Said creature must complete 2d4 day's worth of rest, once completed the creature regains any lost hit points and the sphere return's to its original color.)

For a creature to attuned to a sphere with a monster already inside it, it must succeed on a saving throw of the monster's choice against the Sphere's DC

Notes: For a creature to attuned to a sphere with a monster already inside it, it must succeed on a saving throw of the monster's choice against the Sphere's DC