As a rule, Fair Folk were distrustful of humans and believed them foolish and clumsy. Eiddileg maintained that Prydain had belonged to his people before the coming of "thick-skulled" humans, who (according to his account) had driven the Fair Folk underground and plundered their treasures.Companions, who had blundered into his realm; Doli's demeanor was generally gruff and critical; Gwystyl was gloomy and unhospitable. This attitude may have been a facade in order take a human's measure, or it may have represented their true feelings.
Skills, Powers and Residencesenchantments. They kept treasure houses hidden in secret locales, warded by defensive spells, in which they deposited their enchanted objects and priceless wares. They would part with these treasures only as gifts (such as the wedding present to then-Princess Regat, mother of Angharad) or when compelled to do so by captors (such as Maibon).
Evidently all Fair Folk had the power to turn invisible, a magical talent which only Doli lacked, until this power was imbued in him by the Sons of Don, as a reward for his aid in defeating the Horned King.
The Fair Folk were mortally vulnerable to the evil enchantments of Arawn Death-Lord and specifically to the deadly effects of Annuvin, the Land of Death. During the last war against Arawn, the dwarf warriors serving under Doli had to turn back as the company led by Taran entered into the domain of Annuvin. Only Doli opted to stay, a choice which nearly led to his own demise, until he discovered that turning invisible would protect him from the lethal effects.
Among the names human devised for the Fair Folk were the "Happy Family", the "Little People", and the "Children of Evening". Eiddileg ridiculed all of these, but he further mentioned "Lake Sprites" without scorn, hinting that term was a more official name, perhaps referring to the fish-scaled Fair Folk whom Taran glimpsed during his time in the Kingdom.