Thus far the clan hall is fairly basic, with a simple altar, rooms, and cells in the basement, bedrooms, a kitchen and dining/common area on the main floor/balcony, and a simple library and lab upstairs. Feel free to invest guild resources for team bonuses by adding on. Add on various wings to the hall to earn specific bonuses, and then research additional bonuses. Upgrade the library to gain bonuses to mind, or add meditation wing for soul bonuses, or a training room to gain body bonuses. Add a weapon room to gain special enhancements for your clan’s blades or bows, a workshop to gain access to special item/armor modifications, or upgrade the laboratory to get potions & poisons at a discount. Or how about a strategy room for tactical bonuses and advanced detailed maps for missions. Or whatever you think up.