It's a dimanfix inflection. It means it comes from or derived from one thing. That mana or sprouts from a spring. Proceeds, sprouts, manas, derivas.
Informal second-person singular person of the present indicative form of verbo dimanar . See verbs/demanas .
It seems to me that it is the conjugation, in the second person, of dismantation, whose meaning has to do with emanating, being born, originating. . .