Vampire Crawlers gives you different Gems to pick up during a run, and those Gems let you modify the cards in your deck. They appear randomly, which means you won’t always get the same setup twice, and that randomness can reshape a draft in a hurry. That matters because some Gems can dramatically change how your drafted deck works, so a good pick can save a run while a bad one can leave your build awkward and underpowered.
This guide tracks how every Gem works before you choose one on a run. That should help if you’re trying to make cleaner decisions instead of grabbing whatever shows up first. It also helps because Vampire Crawlers gives you 21 characters to unlock and equip, and each one brings unique strengths that can change which Gems make sense for your deck.
What You Need
You do not need a special unlock to start thinking about Gems, but you do need to understand how your run is built. Since Gems arrive randomly, you have to work with the options the game hands you rather than planning around one fixed outcome. That makes deck awareness a real part of the process, not just a bonus.
Character choice matters too, because Vampire Crawlers offers 21 characters to unlock and equip. Their unique strengths mean a Gem that looks strong on paper may fit one character much better than another. You also need to keep weapon combinations and evolutions in mind, since the effectiveness of a specific Gem depends on the deck pieces you already have.
Step-by-Step
Start by checking the Gem you’ve been offered and asking what it changes in your current deck. The source makes clear that you can use these Gems to modify the cards in your deck, so the real question is whether that change helps your build or pulls it in a worse direction. Because the Gems are obtained randomly, you need to judge them against the run you already have, not the one you hoped for.