5e Specific Answer: Yes, you probably can, but it is hard. The 5e adventure Baldur's Gate: Descent into Avernus has an option to redeem a fiend. Moreover, the following 25.08.2017 twitter exchange is relevant, as Mike Mearls, one of the co-creators of D&D 5e, likens a fiend's risin...
D&D 5e doesn't contain much information about Dagon (most of what I know of demon lords has come from running Out of the Abyss, in which Dagon does not feature, or the Monster Manual and Mordenkainen's Tome of Foes, neither of which mention Dagon at all as far I as can tell). ...
That said, if you had cast mage hand and used it to hold the vial of blood, would it be possible to draw the protective circle at a distance of up to 30ft? dnd-5e-2014 spells spell-components summoning Share Follow edited Aug 14, 2018 at 18:38 V2Bla...