1. Either the monster or my crew could come out of the portal, but if it's your monster then that could maybe work a tad better, but not enough for me to care one way or another if you had specifics in mind. If it's that big it would be hard to imagine it flying unless it has some special ability.

2. Maybe I can have some additional waves of troops coming in over time. If we decide on much over 30 then I'll abandon the idea of it being from the single mascot ship I have for the setting and instead it would be UNT (the good guy alliance) forces, allowing however many we end up desiring. That could also allow people like generals and such that I may get inspired to create.

3. The power level of this setting is usually so that magic users can still be defeated by normal people but some could do things like leap over single two buildings, send out massive flames, etc. Some could defeat a 30 story monster by themselves but they are more rare, of course.

4. I was thinking minimal vehicles but could bring some out.

5. The monster probably wins?