Board Thread:The Last Sovereign Discussion/@comment-87.58.238.209-20190505130813/@comment-36874080-20190505131852

I also don't think that it's worth it. As you said, some unique equipments (a glove for Simon, and something for Yarra OR Nalili, not even both), some Sx and EXP, minor relationship bonuses to girls and countries, also a unique throne, and that's about it. IMO it's probably made to be bought later in game, even tho it's been introduced now. I would recommend investing in the alternatives.

EDIT: Having the Incubus Glove in the inventory may also give some minor bonus when fighting the Fucklord at some point, it was the case for similar items during the Third Arclent War. But that's not much either.