Orbital holy beam satellite of obliteration

[rferries]

Only semi-related, but inspiration struck after re-reading your post, Noob. A slotless item useable by a PC:

Star of Destruction
This marvellous Colossal device is teleported to the heavens upon creation. Thereafter, its controller can call upon its power once per day to rain destruction upon her foes. Activating a star is a free action, but the device requires 1d4 rounds to charge and fire itself automatically.

A star of destruction may duplicate a particular spell once per day, which also determines the caster level and cost of the star (see below). The spell's range is calculated from the controller's space, but the spell's line of effect is determined from the star rather than the controller (this means that the star cannot target creatures and places underground).

Each star of destruction is crafted along with a small gem, the bearer of which controls the star.

Spell	Caster Level	Cost (gp)
fireball	5th	12,000
disintegrate (+5 bonus on ranged attack roll)	11th	52,800
sunburst	15th	96,000

Faint (fireball), Moderate (disintegrate), or Strong (sunburst) Evocation; CL varies; Craft Wondrous Item, overland flight, teleport, and one of fireball, disintegrate, or sunburst; Price varies.