Kelpi

Precisely what you Expect
Where unicorns are always good kelpies are always literal, they respond to expectation and are believed to be born from fears or unclear urges, they are of a kind with unicorns and seem to be similarly capable in all forms, the more powerful ones are sometimes called nuckelavee. If a unicorn is working with them they are safe if literal and they always SOUND friendly and jovial, but they appear to interpret fears and pessimistic expectations as requests of action. As such one who treats with a kelpi and fears for their life will often find themselves mauled or murdered. A passing slightest fear or pessimistic thought can spell doom in their presence. Kelpies who have been wheedled and carefully inspired to do works befitting good may summon unicorns to aide in their tasks. They may ALSO summon nightmares, but the presence of both is preferable to simply more nightmares or kelpies, if a unicorn has agreed to appear the task is likely not to be truly evil. But possibly still harsh.