Mutated Rats usually grow out of rats eating contaminated remains of experiments. Given the rats' ferocious appetite and the thoughtless disposal of residues by alchemists, Mutated Rats are not as uncommon as one might like. They are subject of many rumours and legends as they are hardly met during daytime. This makes it somewhat hard to give an adequate description of their attitudes and abilities. It is certain that their behaviour usually does not change much due to the mutation other than becoming more daring. Rumour has it that depending on their sources of food - the disgusting details will be left out here - they might get frightening intelligent and live much longer than usual rats. Mutated Rats always take the leadership over the common rats in their area. Being the leader, the Mutated Rats rarely leave the deepest lairs but are served and fed by their smaller brethren. In combat they are rarely seen without the company of ordinary rats that seem to serve as their soldiers. They are definitely more powerful and even vital than their smaller kin but they are still not much of a threat for an experienced fighter.
It is also said that some of them actually become immortal and gain magic knowledge from devouring whole books about magic. Those Mutated Rats are actually able to learn certain rat related spells and become powerful ratomancers. However, those are just rumours and there have never been any real facts or credible reports.
Mutated Rats have 550 hitpoints. They are immune to death and earth damage and cannot be paralyzed. Moreover, they are strong against holy damage. On the other hand, they are weak against fire damage. These creatures can neither be summoned nor convinced. In addition, they are able to sense invisible creatures.
Mutated Rats yield 450 experience points. They carry gold coins, skulls and sometimes other items with them.