QUOTE(Noni @ Jun 20 2025, 22:46)

the 'power ups', that would be Gems. You can only hold 1 Gem at any time. And, at end of battle, it will disappear automatically. So, best to use it during battle. Monsterbation has a feature to show the Gem as soon as it drops, so you can use it and don't have to check every time if there is a Gem.
I don't think holding a gem does more than preventing a next gem to drop. So it does not increase your chance of getting other drops. As far as I know they are totally unrelated drop chances. Which means, a monster that drops a gem during battle may still drop that peerless hallowed oak of heimdall at end of battle.... although, most likely it won't.
Unfortunately, not a peerless one, but you did summon it, which I appreciate.
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Legendary Hallowed Oak Staff of Heimdall