But western scholars oppose this identification. In the Avesta, it is the hero warrior-priest "Fereydun" who battles the serpent "Aži Dahāka" (which, for the virtue of 'Azi' being cognate with Sanskrit 'Ahi', snake, is – by proponents of the theory - associated with Vedic Vritra). One Western scholar claims that, in the Vedas, the epithet 'hero' ("sura") is itself almost exclusively reserved for "Indra", while in the Avesta it is applied to "Thraetaona" and other non-divine figures. The term "victorious" is not restricted to "Verethragna", but is also a property of a number of other figures, both divine and mortal, including "Thraetaona". Then, while in the Vedas it is "Indra" who discovers Soma, in the Avesta, it is humans who first press Haoma and "Thraetaona" is attributed with being the "inventor of medicine". In the Vedas, "Indra" strikes with "vajra", but in the Avesta "vazra" is Mithra's weapon.