Unable to upgrade Drakebreaker?

[Vrakthris]

This post may apply to your issue:

@Kaivax

There’s a bug fix in patch 10.0.5 to The Drakebreaker’s Breastplate. Before 10.0.5, it incorrectly cost 7 Trophies of Strife to upgrade. It now costs 10 Trophies of Strife to upgrade. This was done to make it consistent with other chest pieces.

If you otherwise believe you may have encountered a bug, I’d recommend posting in the Bug Report forum so our QA team can take a look.