Sorry, it sends them from 'your' home plane.
even if it worked that way, there is a 20% chance that you would not go to yourhome plane. To make things worse there is NO way to specify where in that plane the creature[you in that case] is sent. No prohibitations against you apearing in [or even above] a 'hostile' or hazardous area like conjurations either. Even if the spell can not or does not send you to an uninhabital place, you may wind up on another planet on your plane if that is supported by your cosmology.
Banishment
Abjuration
Level: Clr 6, Sor/Wiz 7 Components: V, S, F Casting Time: 1 standard action Range: Close (25 ft. + 5 ft./2 levels) Targets: One or more extraplanar creatures, no two of which can be more than 30 ft. apart Duration: Instantaneous Saving Throw: Will negates Spell Resistance: Yes
A banishment spell is a more powerful version of the dismissal spell. It enables you to force extraplanar creatures out of your home plane. As many as 2 Hit Dice of creatures per caster level can be banished.
You can improve the spell’s chance of success by presenting at least one object or substance that the target hates, fears, or otherwise opposes. For each such object or substance, you gain a +1 bonus on your caster level check to overcome the target’s spell resistance (if any), the saving throw DC increases by 2.
Certain rare items might work twice as well as a normal item for the purpose of the bonuses (each providing a +2 bonus on the caster level check against spell resistance and increasing the save DC by 4).
Arcane Focus: Any item that is distasteful to the subject (optional, see above).
Dismissal
Abjuration
Level: Clr 4, Sor/Wiz 5 Components: V, S, DF Casting Time: 1 standard action Range: Close (25 ft. + 5 ft./2 levels) Target: One extraplanar creature Duration: Instantaneous Saving Throw: Will negates; see text Spell Resistance: Yes
This spell forces an extraplanar creature back to its proper plane if it fails a special Will save (DC = spell’s save DC – creature’s HD + your caster level). If the spell is successful, the creature is instantly whisked away, but there is a 20% chance of actually sending the subject to a plane other than its own.
