Damage Reduction question

[hawkfu]

Hello,

Question: I wanted to buy Damage Reduction and add the modifier Costs Endurance. The question is then, does it cost End whenever it's used 9like whenever he gets hit?) or is like a force field where I turn it on and pay end everyphase it's active?

Thanks,

Hawkfu

[Steve Long]

See 5ER 100 re: applying Costs Endurance to Persistent Powers.