οἶν

From LSJ

οὕτως ἐξ ἐχθρῶν αὐτοκτόνα πέμπετο δῶρα, ἐν χάριτος προφάσει μοῖραν ἔχοντα μόρου → thus mutual gifts that bring death were bestowed by enemies, gifts that brought the lot of death in the name of a favor

Source

French (Bailly abrégé)

acc. de οἶς.

Russian (Dvoretsky)

οἶν: acc. к οἶς.