Is this both for wars and main raids, Odysseys ?
Piece of advise: Don’t limit the invos in wars. They will accuse you of favoring the top guys. I see people spending hundreds of gems in wars for single raids. You are going to make it harder to beat them without so many invos.
Kudos for them to either trying to win the raid, the island, the war, but also the chests. It’s admirable. You can’t put a real value on titan items, they are so rare, so guarantee 4 titans every war is a good deal…
Plus, think of all the complaints you will get for the game being tough… people will be on 45% permanently, especially the less knowledgable players. Its one thing the raid to be tough, its an other thing to be tough without being able to use invos.