Then, I would say we should starting by finding someone who can cast Divination. To be totally honest, I think opening the gates is a foolish foolish foolish idea. The big bad evils put the elves at the front for two main reasons: 1.) disorient the people fighting in Hyrwl and 2.) to cause us to lower our defenses and open the gates so that they can run in and kill us all.
Seems to me that the Heroes Last Stand, though heroic and everything is EXACTLY what the evils want us to do... and, as such, seems like a silly plan. However, if we can cast Divination, we would be able to tell if such actions truly would be as foolish as I think they would be...
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Divination
Divination
Level: Clr 4, Knowledge 4
Components: V, S, M
Casting Time: 10 minutes
Range: Personal
Target: You
Duration: Instantaneous
Similar to augury but more powerful, a divination spell can provide you with a useful piece of advice in reply to a question concerning a specific goal, event, or activity that is to occur within one week. The advice can be as simple as a short phrase, or it might take the form of a cryptic rhyme or omen. If your party doesn’t act on the information, the conditions may change so that the information is no longer useful. The base chance for a correct divination is 70% + 1% per caster level, to a maximum of 90%. If the dice roll fails, you know the spell failed, unless specific magic yielding false information is at work.
As with augury, multiple divinations about the same topic by the same caster use the same dice result as the first divination spell and yield the same answer each time.
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So, Universe, can Preston or Dorn cast this to help with our little problem with the elves?