"why is that very hard?" because the one thing that kept stopping me is usually the last player who is NOT trying to kill me dying in the void, or if he/she is trying to kill me, they stupidly go through my sea of mobs and get destroyed by them.
if you want to do that yourself you will need these:
mob wand*
lightning wand*
flint and steel*
water bucket (recommended)
soul sand*
lucky island private game (highly recommended)
