lekimbel, here are the stats for Stormbringer - toned down from the Deities & Demigods AD&D 2nd ed module.
Bastard Sword +5: Stormbringer
This version of Stormbringer is a toned down version of the weapon presented in the
Melnibonean Mythos section of the coveted 1e Deities & Demigods. Note: If you are
adventuring in a party, it is a bad idea to give someone this sword AND boots of speed.
When the character berserks, he will catch other party members with ease and they will
probably be dead before he is done.
Usability: Not usable by Druid, Cleric, Mage, Thief, Bard
Set AC to -2
Constitution set to 18
Strength set to 18/00
Detects invisible objects (souls)
Protection from charm, fear, and confusion
Infravision
50% Magic resistance
2 additional attacks
Increase maximum hit points by 10 for each hit (30 minute duration)
5% chance per hit of going berserk
If you use the above abilities, you're looking at 8 Equipping Effects (11 if you count the Protection icons on your portrait) and 3 Item Effects. Pretty complex for your first one - I'd suggest you add each ability one at a time and make sure each one works before adding the next one.
------------------
Memnoch - Custodian of the Holy Flame 
[This message has been edited by Memnoch (edited 03-02-2001).]