This will cause a group of insects or vermin to follow the caster for between two and twelve minutes (director rolls). The size of the group diminishes depending in the size of the animal (i.e. more insects than Rats would be affected e.g. 500 and ten respectively)). The creatures affected may be up to 10 rats, 100 beetle or spiders, 500 small flies or ants. These numbers can be double, tripled, and so forth, at the cost of -2 each time (thus 40 rats, with a modifier of -6).