"Rust (
Ex)
A rust monster that makes a successful
touch attack with its antennae causes the target metal to corrode, falling to pieces and becoming useless
immediately. The touch can destroy up to a
10-foot cube of metal instantly. Magic armor and weapons, and other magic items made of metal, must succeed on a DC 17
Reflex save or be dissolved. The save DC is Constitution-based and includes a +4 racial bonus.
A metal weapon that deals damage to a rust monster
corrodes immediately. Wooden, stone, and other nonmetallic weapons are unaffected. "
Note the use of the word "Immediately" twice and "Instantly" once. Note the mass of a "10-foot cube of metal". If the Sage wants to neuter the Rust Monster because it is so incredibly awesome, then I'd like to trigger the contingeny of @
Dandu 's caster characters' teleportation in his direction.