It is literally a secret rule of D&D, hidden in the core rules

Blade Mastery Feat, the latter two features seem to conflict one another

Do abilities like advance allow a Warlords UA allies to maneuver into their tactical focus while they are frightened?

I’ve been feeling a bit down about dungeon mastering lately

Module B1½ – In Search of the Unknown Unknowns map!

Do you have a player character of your own from a past campaign that’ll always be close to you?

What are the Chamber-CotSilver Flame relations, if any?

Create Your Own Eberron D&D Adventures @ Dungeon Masters Guild

How many D&D groups out there enforce usage of material components in spellcasting?