We have added leeway with the Crown, as the adventure was posted freely on the Wizards site.
So:
The Crown of Souls is a dark and evil object which will bestow upon its owner the following powers:
• The Crown of Souls can be used to transform normal men (though not other humanoids or demihumans) into goblyns. To do this the owner of the crown merely holds it on the head of the victim with both hands, and speaks an ancient incantation. As the transformation occurs, the victim will scream out in anguish and terror as he looses his mind and will and is filled with evilness.
I would allow a fortitude saving throw to resist the transformation and holding the crown over a head should be a full-round action only usable on a willing or helpless opponent.
• Upon the brow of an evil being, the crown bestows the following special powers: -2 AC adjustment, +2 on all attack and damage rolls, +2 on saving throws, +20 hit points, and all class abilities (not hit points) will function as if the wearer were two levels higher.
+2 profane bonus to AC, attack rolls, damage and all saving throws. +20 bonus hit points that stack with any other bonus hit points, such as those granted by the
aid spell.
• Anyone wearing the crown must make a save versus death magic each day. Failure means that a Wisdom check must succeed or the character suffers a slight alignment alteration.
Dungeon Masters are encouraged to adjust the check based on the characters past adherence to his alignment, with a maximum bonus or penalty of 4. Their alignment will slowly become neutral evil. The lawful/chaotic aspect will first change to neutral. Next the good/evil aspect will become one place closer to evil (good becoming neutral, and neutral becoming evil). Once this transformation is complete (for those already neutral evil, they still must fail the wisdom check once), the crown will be in complete control of them. The spirit of the warlock Daglan will drive them to kill Radaga without the crown on.
Wearer must make a Will save (DC 20) each day or their alignment moves one step closer to neutral evil.
Once neutral evil the wearer must make another Will save or become possessed by the spirit of the crown. The crown cannot attempt to posses any character not neutral evil, regardless of Ego score.
• The crown can also protect itself from harm. This can only be done if it is physically attacked or threatened (i.e. attempts to smash it, throw it off a cliff, melt it in a fire, etc. are made). In such a case, it can perform the following spell like abilities once per round as often as needed: affect normal fires, blink, levitate, gust of wind, spectral hand, and chill touch. These will be performed at the 13th level of proficiency.
The crown can cast
produce flame, blink, levitate, gust of wind, mage hand, and
chill touch when threatened as a 13th level sorcerer.
• Only one who is pure of heart (that is, lawful good) may take the Crown of Souls out of the domain which it lies in.
Unchanged.
This would make an intelligent item with no less than 3 greater powers and 3 lesser powers. I’d also give it ten ranks of Spellcraft to round it out. It would likely have an Int of 19, Wis of 19 and Cha of 10.
So its Ego would be (4+6+3+4+4+2+1) counting all of its bonuses. So the DC to resist its possession is 24.
The crown bestows two negative levels on any good character who attempting to wear it and one negative level on any neutral characters.
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