μυθήσεαι

From LSJ

ἀλλ' ἐπὶ καὶ θανάτῳ φάρμακον κάλλιστον ἑᾶς ἀρετᾶς ἅλιξιν εὑρέσθαι σὺν ἄλλοις → even at the price of death, the fairest way to win his own exploits together with his other companions | but even at the risk of death would find the finest elixir of excellence together with his other companions | but to find, together with other young men, the finest remedy — the remedy of one's own valoreven at the risk of death

Source

French (Bailly abrégé)

2ᵉ sg. f. ion. de μυθέομαι.

Russian (Dvoretsky)

μῡθήσεαι: эп. 2 л. sing. med. к μυθέω.