Parties get drop unless they have mebers that are 5 or more levels higher than the boss they are killing. All items in Silent Chamber are non-transferable after they leave party bag and have 30% durability.
Tactics: First person that enters must deal as much damage as he can. Belt: 1 giant elixir, 3 poison slots, 1 slot of blessed scrolls that dropped from Levreta, rest is all life. After losing every 20% of life he will cast Thread of Magish - lets him heal off you when dealing damage. Ideally if you remove it in timely maneer he will only use it 5 times per fight. After first person is out of poison, second one enters, giant, 1 slot of levreta scrolls, 4 slots of poison, the rest is life. If all goes clean, by the time he runs out of poison, His Royal Highness should be already dead. After that, the other party members join with slots enough to kill Spiders. Spideys have 901 HP each and you get to have fun with 27 of them. They cast poison -120 hp per 80 seconds. Ways to kill it: Be a mage, or summon a lot. Net it takes around 80 summons for this fight, but the number can be shortened by killing many spiders yourselves.