What is a Fisto? A Fisto is a person who has had one of their arms replaced or modified with cybernetics to be really really good at punching.
The PCs come face to face with the Big Bad in a fine stately home when he or she casts a spell and the suits of armour lining the walls draw their swords and slowly clank to the attack.
Like the mythical hydra, the Illuminati have many heads and even more hands. The minions of the Illuminati might work to their hidden master's ends without ever knowing the design of their work, or for whom they indeed work for.
Temple of some malign being invites you warmly and offers help (curing,needed spell etc) for some minor sacrifice . Sacrifices must be everytime bigger to work - up to living inteligent creatures. Maybe you pay some other price,too...