So I'm a DM for a group and between a few of us, we have all the source books shared. I've found that when i'm creating a homebrew feat, I don't have access to feats, spells, and other content that are shared with me. So while i can read and use these source books in the campaign, I can't create a feat that uses a spell or other rule from those shared books.
Unfortunately, you can only include SRD material, elements you own, and your own homebrewed creations in homebrew that you create. (Otherwise you'd be able to join a shared campaign, make a homebrew feat or item that gives access to a shared-content spell, and then leave the campaign, giving you a loophole to access to official content.)
What you can do is have the person who owns the content create the homebrew, which everyone in the campaign could then access, or else purchase just the individual feat/spell or whatever that you need from the Marketplace, instead of needing to buy the entire book it comes from.
Or, you can attempt to replicate the spell or feat yourself in homebrew, and then use that. Even folks who own content will end up making a homebrew copy of a spell in order to add it to a new class spell list, etc.
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Helpful rewriter of Japanese->English translation and delver into software codebases (she/e/they)
So I'm a DM for a group and between a few of us, we have all the source books shared. I've found that when i'm creating a homebrew feat, I don't have access to feats, spells, and other content that are shared with me. So while i can read and use these source books in the campaign, I can't create a feat that uses a spell or other rule from those shared books.
Is there anyway to fix this?
Unfortunately, you can only include SRD material, elements you own, and your own homebrewed creations in homebrew that you create. (Otherwise you'd be able to join a shared campaign, make a homebrew feat or item that gives access to a shared-content spell, and then leave the campaign, giving you a loophole to access to official content.)
What you can do is have the person who owns the content create the homebrew, which everyone in the campaign could then access, or else purchase just the individual feat/spell or whatever that you need from the Marketplace, instead of needing to buy the entire book it comes from.
Or, you can attempt to replicate the spell or feat yourself in homebrew, and then use that. Even folks who own content will end up making a homebrew copy of a spell in order to add it to a new class spell list, etc.
Helpful rewriter of Japanese->English translation and delver into software codebases (she/e/they)
Not exactly, you can access all Basic Rules, SRD, and EEPC content here for free. (Basic Rules & SRD were consolidated under “Basic Rules” exclusively on DDB. While the EEPC is (bizarrely, inexplicably, and inaccurately) not included among the list of sources on DDB, but nonetheless it is free content including Goliaths, Aarakocra, Deep Gnomes, and the Genasi, as well as all these spells (subsequently published in Xanathar’s) :
https://www.dndbeyond.com/spells?filter-class=0&filter-search=&filter-verbal=&filter-somatic=&filter-material=&filter-concentration=&filter-ritual=&filter-sub-class=&filter-source=4
Creating Epic Boons on DDB
DDB Buyers' Guide
Hardcovers, DDB & You
Content Troubleshooting