While the 2025 DnD Monster Manual has chilling art, evoking the vibe of the 2e AD&D MM, the game certainly leans more towards transparency than needlessly siloed rules like its legacy editions had.

From the first edition Advanced Dungeons & Dragons Fiend Folio comes the flumph and the slaad (although the slaad have developed a history within the game) and demons from the AD&D Monster Manual ...