Ellington wrote:
What can I do?
if your villain has access to an assassin's guild or any of the under crust of the area, they could spend the time to gather information about the party one of the reasons that most of the other henchmen know how to deal with the summoner, such as who to focus fire on or what spells/effects to bring if they are to face the group, alternatively you could try some simple effects such as tanglefoot bags or other snare effects to slow down his edlion effectively trying to slow it's approach to the combats