Apocalypse Class Weapon - Zod's Terminal Disc

An apocalypse class weapon, Zod's Terminal Disc is a one use weapon of ultimate annihilation for wielder and target.   If unattached to a creature, the disc embeds itself to any creature that comes within 10" that is at least 15th level in power. Any creature may attempt to resist the Disc embedding itself by succeeding a DC 25 charisma savings throw with disadvantage.   Zod's Disc needs to annihilate, and for every week that it is unused, the wielder's maximum hit points reduce by an amount equal to the wielder's proficiency bonus. This cannot be redirected, prevented or recovered. It is permanent.   The wielder may activate Zod's Termination Disc by using an action, bonus action or reaction. When activated the following occurs:

• The wielder immediately takes damage equal to 2x its maximum hit points in force damage, which cannot be redirected, prevented or resisted, to a maximum value of proficiency bonus x 100hp.
• One target within 30" takes the same amount of force damage, which also cannot be redirected, prevented or resisted

If either the wielder or the target survive, their hit point maximum is permanently reduced by 100% of the damage dealt + 1 HP.   If activated, Zod's Disc returns to the 12th interation of Atlantis.   If the wielder dies and Zod's Terminal Disc is unused, the disc unattaches and immediately begins to attempt to attach to a creature of sufficient power.