In some adventures (list below), some of the NPCs have a 0 modifier for their statistics, even if said statistics should net them a bonus or malus. (e.g.: an NPC has strenght 8 and dex 12, but has a 0 bonus on both instead of a -1 malus and +1 bonus) This affects both ability checks and attacks. So far here's the ones I have found, divided by adventure: The master's vault <a href="https://marketplace.roll20.net/browse/module/40/the-masters-vault" rel="nofollow">https://marketplace.roll20.net/browse/module/40/the-masters-vault</a> - Giant Spider - Kobold Shaman Lost Mine of Phandelver <a href="https://marketplace.roll20.net/browse/module/41/lost-mine-of-phandelver" rel="nofollow">https://marketplace.roll20.net/browse/module/41/lost-mine-of-phandelver</a> - Giant Spider - Goblin - Grick - Hobgoblin - Ochre Jelly - Ogre - Orc - Owlbear - Stirge - Twig Blight - Wolf The Forge Of Fury <a href="https://marketplace.roll20.net/browse/gameaddon/154/the-forge-of-fury-tales-from-the-yawning-portal" rel="nofollow">https://marketplace.roll20.net/browse/gameaddon/154/the-forge-of-fury-tales-from-the-yawning-portal</a> - Orc with Longbow It does not seem I'm able to fix said NPC by hand, or at least I've not find a way to.