Im a wizard using a Gate Breaker Ballista. My crew is me + a large construct my character made. (1+4=5 crew members, essentially.) How would i go about calculating my attack role after its all loaded and aimed? I understand how to do all that, but its a ranged touch attack right?
So i use d20 + BAB + DexMod = ??
Is that right? If so, do i use my BAB/Dex or the Constructs?
Your attack role is 'smash big building' in this case. I can't imagine siege engines used as precise enough for sniping and you're definitely not a front line fighter.
The roll, by the way, would be DexMod for a ballista, if memory serves, based on the leader of the siege engine. And a -2 per size category if the weapon's bigger than the firer, modified by crew size and/or having knowledge. This all assumes you have the Siege Engineer proficiency.
See http://www.d20pfsrd.com/gamemastering/other-rules/siege-engines for more info.
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Whoever fires it rolls d20 + bab + dex mod -4 for non proficiency (unless you have exotic weapon proficiency ballista or siege engineer feat --- there's a wizard archetype that gives you siege engineer at 1st level: http://www.d20pfsrd.com/classes/core-classes/wizard/archetypes/paizo---wiza rd-archetypes/siege-mage )