• BlackSkullOfMastery.java - Main item class
• MasteryItem.java - Base mastery item class
• WndChooseWay.java - Window for choosing subclass path
• Lich.java#L87 - Where the item is dropped as loot

This entity does not use JSON configuration, as it's implemented in Java.

English (values/strings_all.xml):

<string name="BlackSkullOfMastery_Name">The Soulbringer</string>
<string name="BlackSkullOfMastery_Info">It\'s an ancient artifact, crafted by first necromancers to collect souls of the fallen one\'s. Sensing your necromantic abilities it warded itself with a powerful spell. But since the spell is that of the old times, it\'s primitive structure is fairly easy to break.</string>
<string name="BlackSkullOfMastery_Title">You may break the spell. Or you may manipulate it\'s magical formula in a way, which will allow you to consume powers of both the spell and artifact itself, turning yourself into a Lich.</string>
<string name="BlackSkullOfMastery_Lich">Become a Lich</string>
<string name="BlackSkullOfMastery_Necromancer">Break the spell</string>
<string name="BlackSkullOfMastery_BecomeLichDesc">The _Lich_ is a necromancer who reached pinnacle of his abilities. Existing between life and death _Lich_ excels in necromancy, but his combat skills are greatly lower than those of an ordinary person.</string>
<string name="BlackSkullOfMastery_RemainHumanDesc">Or if you _break the spell_ you\'ll be able to use this artifact as intended.</string>

Russian (values-ru/strings_all.xml):

<string name="BlackSkullOfMastery_Name">Жнец Душ</string>
<string name="BlackSkullOfMastery_Info">Это древний артефакт, сотворённый первыми некромантами, для того чтобы собирать души павших. Мощное защитное заклятие среагировало на твои магические способности и заблокировало силы артефакта. Но не смотря на силу, ввиду возраста, сама структура заклятия крайне примитивна, и её не сложно разрушить.</string>

This entity is implemented in Java, no Lua script exists.

• Type: Mastery item (special quest item)
• Class Restriction: Necromancer only
• Image: items/artifacts.png, index 19
• Stackable: No
• Pre-identified: Yes
• Use Time: 10 turns (TIME_TO_READ constant)
• Action: “Necromancer_ACSpecial”
• Dropped By: Lich boss (guaranteed drop)
• Purpose: Unlocks Lich subclass choice for Necromancer class
• Choice: Player can choose to become Lich subclass or break the spell to get regular Black Skull item

• Lich - Boss that drops this item
• Lich Subclass - Subclass unlocked by this item
• Necromancer Class - Class that can use this item
• Black Skull - Alternative reward if spell is broken