We all heard the rumors of the disease-ridden rats in the biggest, filthiest cities of Europe. In one particular city, this little monster was a reason for most of the rat infestation - and surprisingly, it also chased out most of the non-conjured rats with it's summoned horde. Unfortunately for it, and nearby villages, when a wizard (or possibly hedge witch) cast a ritual to chase the diseases and vermin out of the city, this little monster had to flee. This lead to a sudden blight of swarming rats roving through the nearby villages and towns and devouring everything.
The Rat of Hungering Blight is a very cunning creature, but it is not truly intelligent. It can create a large number of its rodentia allies, but it cannot control them directly. I would definitely allow the Blight to use its leadership on larger numbers of rats instead of just the 3-4 it normally allows because of how small rats are - say 5 or 10 rats per point of leadership. The Blight can be bound with a Perdo Animal lab total of 5 or higher. Your saga may allow Perdo Terram as well.
Magical Might: 20
Characteristics: Cun +1, Per +1, Pre +1, Com -2, Str -16, Sta +2, Dex +2, Qik +9
Size: -8
Season: Summer
Confidence: 1
Virtues and Flaws: Magical Animal; Greater Immunity(diseases), Second Sight, Sharp Ears, Strong-Willed; Avaricious(hunger, Major), Magical Monster
Qualities and Inferiorities: Greater Power(Disloyal Swarm), Improved Damage x3 (bite), Improved Might x2, Lesser Power x2(Gnashing Teeth of Iron, Devouring Iron),
Personality Traits: Hungry +6, Greedy +1, Careless +2
Reputations: Devouring swarm 4 (local village)
Abilities: Athletics(climbing) 3, Awareness(predators) 4, Brawl(teeth) 4, Concentration (eating) 1, Leadership(rats) 3, Stealth(amid filth) 6, Survival(scavenging) 4, Swim(sewers) 3 [15 xp unspent]
Powers:
Vis: 4 perdo in incisors
Combat:
Teeth: Initiative +8, Attack +10, Defense +15, Damage -15 or -13