Forum:Noob question on effects

Noob question please: can an effect monsters effect be activated at any time (like a trap) or only during the controlling players turn? In this instance, the example is the effect of Demise King of Armaggeddon to pay 2000 lp to destroy all monsters on the field. Gratefu for advice!

86.163.128.231 (talk) 13:20, December 10, 2011 (UTC)