In order to attack this eb, players must use a pair of items out of 10 allowed items. If they choose the wrong pair, the enemy gets a boost in energy. But if player used the right pair ( there came several) they get a big reward. Other pairs are possible also but the hits are not as big. If nobody could guess the right pair, they can buy nobs for exchange of clues as many as they want. This process can be repeated along the eb.Shorter time allowed to finish the EB will make it more challenging. I suggest the big reward to be 10 trillion gold plunder or more who guessed the right pair(s). What should be the rewards?
So you're suggesting something akin to God mode, except instead of the time you can hit being randomized, the items you use to hit are randomized (out of the pool of possible item)?
All players have to guess which pair will give the big reward to hit EB and the most damage to each phase.