Basically i'm playing in an evil group and i am an assassin i may like to keep my options open to poison or kill others in my party...lol but heroes feast totally negates my poison abilities. Like to know ways of getting around things like poison immunity. thx
So poison them more than 12 hours after the meal.
The spell specifically says that it feeds them for a day. As in, unless they want to get fat they won't be using that spell again for 24 hours. The poison immunity portion only lasts 12 hours.
Lots of players forget that and think, "Well, I had breakfast this morning, so I'm good for the day". And they are good for the day. Just not the night that follows.
But hey, who ever heard of an Assassin working at night, alone in the dark?
So, something in the evening fire to generate poisonous smoke? A little something in their waterskin? (Lots of people like to start the day by rinsing out their mouth to get rid of that morning taste.) A little contact poison applied to the inside of a bedroll? Inside that neat armor they're going to put on first thing, before they have breakfast?
Alternately, consider a
Dispel Magic effect (Probably the Greater, considering levels), or some form of Anti-Magic. That will drop the
Hero's Feast effect, at least temporarily.
One problem is, of course, that at that level spells like
Raise Dead and
Resurrection are in play, meaning that the poisoned character won't be out of play very long.