Needs review
Source: Complete Book of Eldritch Might

Description: You can etch magical runes onto the surfaces of inanimate objects.

Prerequisites: 5th Level Caster

You can create an etched object rune of any spell that you know. Etching an object rune takes one day for each 1,000 gp in its base price. The base price of an etched object rune is its spell level multiplied by its caster level multiplied by 30 gp. To etch a rune, you must spend 1/25 of this base price in experience points and use up raw materials costing half this base price.

Any etched object rune that stores a spell with a costly material component or an XP cost also carries a commensurate cost.

In addition to the costs derived from the base price, you must expend the spell’s material component or pay the experience points when etching the rune.

Any object with a solid surface can bear an etched rune.

Normally, a Small object (or smaller) can have only one object rune, while a Medium object can have two, a Large object can have four, a Huge object eight, and so on. The etching does not harm the object in any way, and once the rune is used, the object returns to normal.

Once an object rune is etched, it can be used like a scroll, as described in the rules for casting spells from scrolls.