Augment Object

Stronghold Builder's Guidebook (SB)Supplementals (3.0)
School
Transmutation
Casting Time
1 minute
Components
V, S, M
Range
Close (25 ft. + 5 ft./2 levels)
Target
One object, up to 200 cubic ft./caster level
Duration
1 day/level
Saving Throw
None (Object)
Spell Resistance
Yes (Object)

This spell adds +20 to the break DC of the object and doubles its hardness and hit points. An augmented object also gains a saving throw against spells when unattended as if it were a magic item (save bonus equals 2 + half the caster level).

Material Component: A pinch of chalk.