Yes you can have more then 1 silverlight in the nights room drop silverlight and give him 500gp to get silverlight back then pick-up the one you dropped then you have more then one silverlight.
My username is Danielded
and i got 11 silverlights from doing this
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You have to do the demon slayer quest and near the end a person gives it to you to defeat the demon with it for silverlight. to get the blurite sword you have to do the knights sword. And you have to defeat the demon with the silverlight...
only against demons
yes, if you make another account
According to the official Runescape FAQ It is not possible to pay for more than one month of membership at a time. (actually you can get 30day and 90day, maybe 60day too I'm not sure Well, runescape just released the one year membership cards again! You can buy them at rite-aid.
They have the same bonuses in combat terms, people mainly buy saradomin as as cosmetic item more than anything else.