From Edge of Darkness Wiki
Just as Odin had Hugin and Munin and Sleipnir, some Thyrsus mages are able to have multiple familiars. The mage may continue to buy additional familiars after character creation. The mage’s player must buy them all separately with experience points, but there’s no limit to the number of familiars a mage with this Merit may acquire. Though many familiars would slow the mage’s growth in other areas, a mage could theoretically sur- round herself with a veritable brood of familiars in this way.