Dragon Slayer 4(Legacy of the Wizard) Lightball

ドラゴンスレイヤー4 ドラスレファミリー キャラクター図鑑

Lightball / ライトボール

Official illust
Manual / Kadokawa guidebook

JICC guidebook

Basic info

Kadokawa guidebook
It is the fairies of the cave country of Southern Ireland, and are gentle and friendly. Legend has it that they can light up the underground gloom with a hint of light and help guide people who have lost their way.
JICC guidebook
It is a round monster with a hat as a charm. It's movements are slow and not particularly disturbing. No one knows how it came to be.