Zarrath's Bottle- Cursed Item

System- Dungeons and Dragons 3/3.5 (Can easily be adapted to any fantasy system or setting)

Somewhere along our hero's adventure they come across a curious copper bottle.  The bottle is small, no bigger than a normal potion flask and the top is stopped with a common cork stopper.  A Spot Check DC 15 will show faded indentations on the side and a Decipher Script DC 20 shows that they spell ZARRATH.  The bottle feels full of liquid and anyone opening it can see some type of liquid inside that smells faintly sweet with a hint of lilac.  Casting Detect Magic shows an strong aura of Transmutation. Casting an Identify spell yields it to be a bottle of Ever Refilling Flask of Bulls Strength, usable 3/day.  Casting Analyze Dweomer will reveal the item to be cursed, but the specific nature is unknown.  If Detect Thoughts, or a similar spell/psionics is used upon the bottle a unspecified sentience is detected but nothing more.  The bottle is actually a powerful soul trap and the previous drinkers soul is trapped inside.  Anyone drinking from the bottle instantly will have their soul switched, no save allowed, with the soul inside.  In game terms this works exactly like the spell Magic Jar.  The DM can choose whomever's soul to be in the jar but if one is so inclined roll a d10 and consult the following table:

1. Harvil Anterwule- Chaotic Good Level 3 Human Commoner.  Been imprisoned inside the bottle for 256 years.  Found the bottle in his field while farming and though it to be wine.  Has no idea what happened.
2. Rak Terr- Chaotic Neutral Level 9 Half-Orc Barbarian.  Imprisoned for 34 years.  Last thing he remembers is drinking from a strange bottle handed to him at a tavern by an wizened old man.  When he finds out what happened he will swear revenge on the man who did this to him.
3. Yurvee Brownstone- Neutral Evil Level 1 Human Necromancer.  Drank for the bottle 1 year ago after stealing it from a fellow wizard.  Will try and fool anyone in the party to who he is.  Sneaks away at the first opportunity.
4. Bra.....something- Neutral Good Level 9 Rogue.  Imprisoned for 1,233 years.  Bra... can't really remember his name or anything else.  Such a long time in the bottle has caused his memories to fade.  
5. Grunf- Neutral Evil Troll.  Angry and Hungry.  Been inside for 3 years.  Really really angry when he does not regenerate.
6. Errisive Rosewood- Chaotic Neutral Level 4 Bard.  Drank from the bottle 129 years ago on a bet to his one of his companions.  Wants to travel with the party.
7. Losive Othire- Chaotic Evil Level 12 Fighter.  Was tricked by an enemy to drink for the bottle 58 years ago.  Will try and intimidate the party in doing his bidding, kills all those who oppose him.
8. Amas Salvento- Lawful Good Gnome Level 7 Cleric- Been imprisoned for half a year.  Will do everything he can to help the party make things right.
9. Ulveesteen- Neutral Evil Mind Flayer- Inside the bottle for 22 years and wants his Mind Flayer body back and will do anything to do it.  Will play along with the party as long as they agree to help.
10. Zarrath- Chaotic Good Level 47 Human Wizard- After drinking from the bottle, some 8,573 years ago, he has been trapped.  His mind is fragile and he is quite insane.  While not openly hostile he will cast powerful spells on a whim, often with disastrous results.     

     Casting a Wish or Miracle spell will reverse the effects of the bottle and force the possessing soul back in the bottle.  If the bottle is destroyed or disenchanted while a soul is inside it is lost forever, no resurrection or reincarnation is possible.  The only way to totally reverse the effects of the curse is to find Zarrath's notes on its creation, which could be anywhere depending on what direction the DM wishes to lead the party.