Fintan Finegas

is the anecdote of the wisdom granted to Fionn mac Cumhaill from the oil of the becoming a Noble Phantasm. Because of this salmon's fat that remained attached to one of Fionn's thumbs, it is said that licking it quickly will grant great wisdom. This Noble Phantasm is the origin of the Uisce Beatha Noble Phantasm as the latter depends on this very anecdote.Fate/Grand Order material III - Fionn mac Cumhaill, p.124-133
Perhaps there seems to be another True Name for this Noble Phantasm.
By the way, the fat of salmon contains a lot of DHA which increases concentration.
==References==
ru:Финтан Финегас
Category:Noble Phantasms
Category:B rank Noble Phantasms
Category:Anti-Wisdom Noble Phantasms
Category:Noble Phantasms introduced in Fate/Grand Order
Category:Noble Phantasms of Fionn mac Cumhaill