Assassin's Globe

You transform a large pearl into a Tiny globe of force and whisper the name of a person you can see. This globe has 80 hitpoints and is immune to psychic damage. It has a flying speed of 30 ft., a Dexterity score of 20 (+5 proficiency bonus to saves), an Intelligence score of 6, and an armor class of 16. The person whose name you whispered becomes the globe's target. The globe will now attempt to touch that person and explode, using any means necessary to reach it. In combat, the globe takes its turn directly after yours. When it hits the target, the target takes 60d6 force damage. If the globe brings the target to 0 hitpoints, the target dies instantly.

However, if the globe touches another person, all creatures within 5 ft. must make a Dexterity saving throw; taking 40d6 force damage on a failed save and half as much on a successful one. The globe will attempt to evade collision with non-targets. If a non-target attempts to touch it, they must make an unarmed strike attack against the globe's Dexterity saving throw.

The globe may have one of three buffs: evasion, stealth, or damage. Evasion grants a +2 bonus to Armor Class and Dexterity rolls. Stealth grants a +5 proficiency bonus to stealth checks and an intelligence score of 14. Damage changes the damage to the target to 75d6.

Once conjured, the globe is a sentient being with the sole goal of exploding at its target. It cannot be stopped by the caster after it is casted without attacking it directly. If the globe recognizes that reaching its target is impossible, it will make a desperado attack designed to kill as many people as possible.