mmu1 said:
Here we go again... Gate lasts ONE round per level, so an army actually can't really use them to move into a city, unless it's very small army - if you had enough 17th+ level spellcasters to pull it off, the army itself would be completely irrelevant compared to what they could do.
Also, using Gate to summon something from another plane costs 1000xp.
Not to mention that all the high level wizards and clerics in the place would likely have something to say about that, and that this particular army is being led by 6th-10th level wizards, so it's not exactly going to be gating anything in anytime soon.
Here's a spell that is better than gate for army use. Fistandantilus's Portal
Sor/Wiz 8
Duration Concentration +1 round
500 XP cost
That's right unlimited duration as long as you concentrate! Basically a same plane gate with small chance of error as in teleport. It's in the DLCS, but of couse getting the spell for the Realms won't be easy