I’ve also come across some missing spells or monsters in the 5th edition compendium SRD. I did find this on Roll20’s site though: "Why isn't there an entry for (Spell, Rule, Monster, Etc.) in here?" While it is possible that a Compendium could be missing content, especially in the case of newly built Compendiums, it's important to note that an OGL version of a rule system may not cover the entirety of the published rule system it's based from. For instance, the D&D 5th Edition OGL SRD does NOT have entries on Displacer Beasts or Mind Flayers , nor do they cover any other feats beyond Grappler . That is because they were purposely not included in the SRD (System Reference Document) when the publisher designed it. If something is missing from a Compendium, you should first check to see if that entry is actually part of the OGL SRD. If something is missing, please report this by contacting us through our web form. So perhaps contact Roll20 through that web form?