Ṇgʷnís
Or as I write it Ngwnís. Also found as H₁n̥gʷnis. Their name means "the active force of fire".
They are the deity of fire, lighting and artisans.
This source characterizes them as genderfluid and a trickster. They are a companion of Perkwúnos as the lighting for his thunder.
The same source connects Ngwnís to Promṇdhḗus or Promāth₂ew, which is the Proto Indo-European name origin for the later stories of the Greek Prometheus and the Indian Mātarishvan (a title of the god Agni, a descendant of Ngwnís). They are said to have stolen fire from the gods and given it to humanity.
Offerings
Fire
Candles
Imagery related to fire or lighting
Devotional acts
Light a fire in their honor, maybe a bonfire (safely)
make a craft
make jokes or pranks
help others who need you
Associations
Fire
Heat
Lighting
Artisans and crafts
Descendants in later pantheons
Agni (Vedic)
Enji (Albanian)
Ungnis (Balto-Slavic)
Finally, here's his wikipedia article
