Forum:Lava golem and archfiends

Yugioh Card: You got lavagolem and Shadowknight Archfiend on field with only 1500Lp, how much life points do you have in the end, 1000? or -600? Lavagolem = burns 1000LP each standby phase. While Shadowknight Archfiend pay 900LP in standby phase (not optional,unless you cant afford to. link below). Which effect goes first? Burn a 1000LP and destroy Shadowknight Archfiend? or Pay 900 and die? http://yugioh.wikia.com/wiki/Card_Rulings:Shadowknight_Archfiend "Paying Life Points is mandatory, not optional"