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theCommanderDJ Does stabilising a creature while within 5ft of an enemy provoke an Attack of Opportunity?
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JeremyECrawford The only thing that provokes an opportunity attack is leaving a foe's reach, unless a feature says otherwise.
@MFBurritt mechanically, would "full" orc PCs be a subrace of half-orc (i.e. mostly the same but w/aggressive)?  sorry if redundant
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JeremyECrawford Orc would be its own thing, just as elf isn't a subrace of half-elf.
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Josh_watson If a mount uses the Dodge action in combat, does the rider also gain the benefits of the Dodge action?
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JeremyECrawford  A mount dodging doesn't mean the rider is dodging.
@MrMattFree Does light from a magic weapon’s characteristics (not via a spell) count as magical that can illuminate a Darkness spell?
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JeremyECrawford  Darkness cares only about light created by a spell.
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SalmonSquire Do you first think of a character you want to play or a mechanic you want to use when rolling up a new character?
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JeremyECrawford  I think of a character concept—personality, look, status in the world, beliefs—then use the #DnD rules to create it.
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Lorindil I It came up in recent game, so, does spiritual weapon actually occupy a space? Player argues what it does. 
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JeremyECrawford Spiritual weapon—the spectral weapon created by the spell doesn't occupy its space the way a creature would.