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The Chainmail script was written by David Leslie Johnson, who wrote Wrath of the Titans, a couple of episodes of The Walking Dead, and Red Riding Hood. He’s also been a frequent assistant to Frank Darabont, so has learned from one of the best. Teh script will be adapted to the D&D property.
One troubling association: one of the producers is Courtney Solomon, who directed the 2000 Dungeons & Dragons feature, not a triumph.
D&D, of course, is one of WotC’s foundational properties, but its recent sales have not reflected its level of awareness and cultural influence. Over the years over $1 billion worth of D&D products have been sold, but currently the brand is in an interregnum period. WotC has recently been reprinting earlier editions (see "WotC Does 'White Box'") as it goes through an extended period of development on the D&D Next edition (see "'D&D Next' for 'D&D Encounters'").