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RE: Steemmonsters Dark Energy Crystals update's SUMMARY
Yes, they do stack. I know this for sure as I get 40% bonus in some battles.
I think it's 10% for each alpha being used. Gold also stacks, probably 10% as well. Can't say for sure but I think it's 20% for a gold alpha. I'm also under the impression you just add the %s, don't multiply. I don't have any promo cards, so I wouldn't know.