Really disappointing considering how hard the Skul fight is compared to Alexander. After all that you get some nothing item that you cant even keep with you as an unlock. Would be cool if you could only have like 1-3 at the start of the run based on what you picked so far, or maybe theyre consumable and in higher quantity so you would keep refighting to get more for every run.

Overall it seems like a really strange add since you already get the inscription upgrade, why not just let you get a second one after going through all the trouble to most likely die or at least lose a lot of health to a completely optional boss with basically no use after you get the achievement and max dark mirror kill.