<l:1,43>Clerics<e>, <l:1,44>Televangelists<e> and <l:1,45>Humanitarian Aids<e> can sell indulgences, which adds <l:6,96>happiness<e> while draining gold from the target <l:6,104>city<e>, and sending it to the attacking Civilization. This attack is always successful and it's free.