Possible Clues:

• Tabletop RPG
• Tabletop RPG with warlocks and wizards
• Tabletop game with campaigns, for short
• Role-playing game with a 20-sided die, familiarly, and a feature of this puzzle's four longest answers
• Popular tabletop role-playing game (Abbr.)
• RPG with a 20-sided die
• RPG with 20-sided dice, for short
• Game with a 56-Across character class, for short
• Tabletop role-playing game, for short
• Fantasy role-playing game, for short