I 've never picked a cursed weapon in L2Off,but i think you might find C5 notes helpful.
http://www.lineage2.com/news/chronicle5_08.html#zariche
If you take a look at 2,3,8,9 , you will notice that skill usage is possible.
Wars and Parties
The following will be applied to the character who possesses Zariche in PvP, clans wars, and in parties.
1. A player carrying Zariche cannot attack players that are level 20 or lower. In the same respect, players must be level 21 or higher to attack the character wielding Zariche.
2. When striking (excluding magic and physical skills) players, including Heroes, their CP is instantly reduced to 0.
3. When a Hero strikes (excluding magic and physical skills) a character wielding Zariche, the CP of that character is instantly reduced to 0.
4. PK penalties such as experience point loss, item drops, karma increases, etc. will not be applicable to either side when a player wielding Zariche is involved.
5. A player wielding Zariche cannot join a party with other players.
6. If a player acquires Zariche while in a party, that character is automatically withdrawn from that party.
7. The player wielding Zariche cannot use the party matching system or command channel.
8. The player wielding Zariche cannot give or accept buffs and may not be healed or heal other players. However, he or she may use buffs and heal themselves.
9. The player wielding Zariche may summon a pet/servitor, but may not ride a pet.