Likely the Halberd of the Rock which is a cursed weapon that drains your stamina. Drop it or sell it.

I havent played the game in years, but as regards the socketing, iirc everything in DD is randomised, so save before doing everything, eg. before you put the cursor on a chest, save, then open the chest, if you dont like whats in it, reload the save and the contents will be different, maybe its the same for sockets.

you're completely right..i have that axe in my inventory lol...it said there's something strange about the axe so i thought it must be something very special...hahah

Like Kezardin says . . it's probably the Halberd of the Rock staff. If you have it in your inventory your stamina will drain constantly. You usually pick it up at the Cursed Abbey See # 3. You can sell it but it's better just to drop it or sell it ASAP.

To add charms to equipment you need to invest points in the "enchant weapon" skill. One point will allow you to insert one charm, two points will allow you to insert two charms, etc, etc. It's worthwhile to bring your enchant weapon skill up to five over the course of the game. You can then pick a piece of armor or weapon to add certain charms to. For instance, finding a good helm to add intelligence charms to raises your intelligence level without having to spend valuable skill points which lets you raise other helpful skills instead.

The down side is if you find a much better helm you have to decide on keeping the helm with the charms or equipping the better helm with no charms. Charms cannot be removed once inserted. Usually the protection of the new helm is so much greater than the one you are wearing that it is worth equipping since charms found later can be much more powerful than the charms you find and insert early in the game. Later you find silver and gold charms and insert them into the helm for the max benefit to your Intelligence, Constitution,Dexterity etc.

More about charms here

If you post your DD questions in the Divine Divinity forum it would make it easier for other DD players with similar problems to find the solution. . .=)