Crepusculous sets herself to fight when the portal is summoned but calms as she realises what it actually is.  Instead she reads a scroll (greater magic fang) and readies a spell.  As eager as she might be she has no intention of entering the portal first.  Instead she sits on her haunches, her form and colour rippling until she looks exactly like a gold dragon.<br/><hr/>DC 26 spellcraft for the portal