A Tremere can be bonded to a whole Council?
After being embraced (by a single sire), a Tremere undergoes a Thaumatugy ritual called the Transubstantiation of Seven. It is also known as receiving the Cup. Blood is taken from the Council of Seven, and transformed into a alchemical powder. This is a safety measure. If outsiders captured the powder, it is useless to them. Jars of this powder are stored at each Chantry. When someone is embraced, a potion is created from the powder, and fed to the Fledgling. The result is a first level blood bond to all seven council members. Unlike the normal bond, the third use of this Thaumatugical ritual causes full bonding to all seven members instead of to just one. Merits and Flaws for being embraced without the Cup can be found on page 67, of the Revised Tremere Clan Book.