Homer several times uses the subjunctive αἰδέσεται. I would have expected this to be αἰδέσηται, and wiktionary agrees with me. I guess the lack of an augmented initial vowel is a hint that this is a subjunctive. Homer seems to do this fairly often with the aorist middle, so we get ἀμείψεται, γεύσεται, δαμάσσεται, δοάσσεται. In some cases, like δαμάζω, wiktionary lists these as epic forms, and the ε only seems to happen in the third person singular.
Is this just some random thing about how this particular tense, mood, number, and person is inflected in Homer's dialect? Is there something more understandable going on? Is it just a cheat to fit the meter?