Magic item attunement is equal to proficiency bonus, and most items don't have attunement unless attunement unlocks additional powers for the item.Variant Human is banned, but everyone gets a Feat at level 1.
ASI's are based on character level, not class level (save for "bonus" ASI's like the Fighter and Rogue).
Bonus Action spells can be used in the same turn as leveled spells.
Casters do not need a free hand to cast spells (originally this was for Clerics only, but thinking about it, I didn't see a real need to prevent Eldritch Knights from using shields).
Concentration is no longer determined by a Constitution saving throw. It uses the same mechanic, but now all casters use Constitution modifier + proficiency bonus by default, whether or not they have Con save proficiency.
Resilient can be taken multiple times.
Customizable Backgrounds.
Instead of Short Rests taking an hour, characters can take 5 minutes to get the benefits of a Short Rest a number of times per day equal to their proficiency bonus.
Wild Magic Sorcerers regain the use of Tides of Chaos under the following circumstances:
*any natural 1 or 20 is rolled at the table (whether or not it would be ignored due to advantage/disadvantage, or would be rerolled).
*if they have Inspiration, they can trade it in to regain Tides of Chaos.
Half-cover for a Medium creatures is considered to be three-quarters cover for a Small or Tiny creature. Three-quarters cover for a Medium creature is considered to be total cover for a Small or Tiny creature.
Bonus action to drink a potion (forgot this until I saw it was mentioned above!).
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