Your question is fairly confusing. You can't make a "Cold Fire Block" with Diplomacy. You can use Influence 4 to generate Ice Block 4 (or Fire Block 4, it doesn't matter which in this case), which will block 2 points of a Cold Fire attack. And generate the rest of the blocking that you need some other way.This is what I was trying to determine ---- whether it was legal to use the Diplomacy card to block a Cold Fire attack (albeit at half strength in combination with other blocks from other cards). What puzzled me was whether Diplomacy needed a Fire or Ice attack in order to be utilized. Thank you for answering the question for me.