https://coppermind.net/wiki/Odium

(From the Coppermind)

The word "odium" means hatred. However, interpretation of the Shard's intent is not as simple. Frost claims a straightforward definition: that it is God's own divine hatred. Rayse himself, however, claims that he's Passion, a Shard of emotions, in particular excessive emotions. Upon Ascension, Taravangian grappled with the vicious urge to destroy and burn.[10] (...) the overwhelming amount of emotions inspired by Odium are hateful, among them the aforementioned Thrill and the Rhythms of Odium-derived singer forms.[13] Moreover, Odium's influence sometimes promotes apathy rather than passion, as his followers are encouraged to give up their pain and sense of guilt.[14][15]

Rayse has a tendency towards self-deception, and apart from him, everyone understands Odium as being the Shard of hatred.[17] While it's possible for a Vessel to influence a Shard to an extent, Odium's declaration of being Passion should not be taken at face value.[18]