Baldur's Gate : The Sword Coast Chronicles : NWN2 Persistent World

I've read the original script of bigby series. It seems only caster level and ability modifier count in caster rolls. For example in bigby7:

Grapple check:
Caster Roll: d20 + Primary Spell Ability Modifier + Caster level + 10 - 1
Target Roll: Target's full AC

Hold check:
Caster Roll: d20 + Primary Spell Ability Modifier + Caster Level + 10 + 4
Target Roll: d20 + Full base attack bonus + Size Modifier + Strength Ability Modifier

Spell focus does not count in caster rolls. Spellcasting Prodigy and epic cl DC bonus are not counted either. I know now the bigby series have been altered. Target Roll will use escape arts skill instead. But how about the caster rolls in the new script? Will either of Spellcasting Prodigy, Spell Focus series and epic cl DC bonus help in the caster roll?

Target will use the best of (AC, escape artist), otherwise the checks for bigby 7/8/9 scripts are vanilla ie spell focus, prodigy, epic CL DC bonuses are not taken into account.

What does "Full BAB" mean here?

usually this term means BAB of a warrior class. Does that mean even a Wizard lvl 30 would defend with a 30 BAB?

Not that it matters, it would still be irresistable.

I'm not sure why "full" was added, it's just BAB, a wizard 30 has 15 BAB see there for more : http://nwn2.wikia.com/wiki/Base_attack_bonus

The fomular from caster side is unchanged? OK thanks for the information. Though I feel the original script is ugly here. If caster has wizard level, use Int as primary spellcasting ability modifier. Otherwise use Cha isntead. So a Sor29/Wiz1 will be regarded as wizard and count his Int modifier into caster roll, not Cha. But this should be very rare happened in BGTSCC so nevermind