Feats

At class levels 4, 8, and 12^{[Needs Verification]}, players can choose to take a feat instead of increasing their Ability Scores. Feats are character features that grant unique abilities or bonuses which improve a character's abilities in specified areas.

 Fighters and  Rogues also gain access to bonus feats, with the fighter gaining a bonus feat at level 6 and the rogue at level 10.

Feats

Feat	Description
Ability Improvement	Note: While technically not a Feat, Ability Improvement is offered within the Feat Selection menu. Increase one Ability Score by 2, or two Ability Scores by 1. You can't increase an Ability Score above 20 using this feature.
Actor	Your Charisma increases by 1, to a maximum of 20. Your Proficiency Bonus is also doubled for Deception and Performance checks. Note: despite not mentioning this in the tooltip, the character also gains proficiency in these 2 skills if he didn't have those proficiencies yet (game version: 4.36.34458).
Alert	You gain a +5 bonus to Initiative and can't be Surprised.
Athlete	Your  Strength or  Dexterity increases by 1, to a maximum of 20. When you are Prone, standing up uses significantly less movement. Your Jump distance also increases by 50%.
Charger	Gain the following weapon attacks: Charger: Charge forward and slam your weapon into the first enemy in your way. Doesn't provoke Opportunity Attacks. Use both an action and bonus action to charge up to 9m and make a melee attack that deals +5 damage. Shove: Charge forward and Shove the first enemy in your way. Shove distance depends on your  Strength and the target's weight.
Crossbow Expert	When you make crossbow attacks within melee range, the Attack rolls do not have Disadvantage. Your Piercing Shot also inflicts Gaping Wounds (Condition) for twice as long.
Defensive Duellist	When you are attacked with a melee attack while wielding a Finesse Weapon you are Proficient in, you can use a Reaction to increase your  Armour Class by your Proficiency Bonus, possibly causing the attack to miss.
Dual Wielder	You can use two-weapon fighting even if your weapons aren't Light, and you gain a +1 bonus to  Armour Class while wielding a melee weapon in each hand. You cannot dual-wield Heavy weapons.
Dungeon Delver	You gain Advantage on Perception checks made to detect hidden objects and on Saving throws made to avoid or resist traps. You gain Resistance to the damage dealt by traps.
Durable	Constitution increases by 1, to a maximum of 20. Regain full Hit Points every time you take a Short Rest.
Elemental Adept	Your spells ignore Resistance to a damage type of your choice. When you cast Spells of that type, you cannot roll a 1. Damage resistance options are one of the following: Acid Cold Lightning Fire Thunder
Great Weapon Master	When an attack with a melee weapon lands a Critical Hit or kills a creature, you can make another melee weapon attack as a Bonus Action that turn. When attacking with Heavy melee weapons you are Proficient with, Attack rolls take a -5 penalty, but their damage increases by 10. (This is a toggleable passive effect; see Great Weapon Master: All In for more information.)
Heavily Armoured	(Requires  Medium armour Proficiency) Increase your  Strength by 1, to a maximum of 20. Gain Proficiency with  Heavy armour.
Heavy Armour Master	(Requires  Heavy armour Proficiency) Increase your  Strength by 1, to a maximum of 20. Incoming damage from non-magical attacks also decreases by 3 while you're wearing heavy armour.
Lightly Armoured	Increase your  Strength or  Dexterity by 1, to a maximum of 20. Gain Proficiency with  Light armour.
Lucky	You gain 3 Luck Points. These can be used to gain Advantage on Attack rolls, Ability Checks, Saving throws, or to make an enemy reroll their Attack roll.
Mage Slayer	When a creature casts a Spell within melee range of you, you have Advantage on any Saving throws against it, and you can use a Reaction to immediately make an attack against the caster. Enemies you hit have Disadvantage on  Concentration Saving throws.
Magic Initiate: Bard	Learn 2 Cantrips and a 1st-level Spell from the Bard spell list. You can cast the 1st-level Spell once per Long Rest. Your Spellcasting Ability for all three spells is  Charisma.
Magic Initiate: Cleric	Learn 2 Cantrips and a 1st-level Spell from the Cleric spell list. You can cast the 1st-level Spell once per Long Rest. Your Spellcasting Ability for all three spells is  Wisdom.
Magic Initiate: Druid	Learn 2 Cantrips and a 1st-level Spell from the Druid spell list. You can cast the 1st-level Spell once per Long Rest. Your Spellcasting Ability for all three spells is  Wisdom.
Magic Initiate: Sorcerer	Learn 2 Cantrips and a 1st-level Spell from the Sorcerer spell list. You can cast the 1st-level Spell once per Long Rest. Your Spellcasting Ability for all three spells is  Charisma.
Magic Initiate: Warlock	Learn 2 Cantrips and a 1st-level Spell from the Warlock spell list. You can cast the 1st-level Spell once per Long Rest. Your Spellcasting Ability for all three spells is  Charisma.
Magic Initiate: Wizard	Learn 2 Cantrips and a 1st-level Spell from the Wizard spell list. You can cast the 1st-level Spell once per Long Rest. Your Spellcasting Ability for all three spells is  Intelligence.
Martial Adept	Learn two manoeuvres from the Battle Master archetype and receive 1 (additional) Superiority Die to fuel them. You regain expended Superiority Dice after a Short or Long Rest.
Medium Armour Master	(Requires  Medium armour Proficiency) When you wear medium armour, it doesn't impose Disadvantage on Stealth checks. The bonus to  Armour Class you can gain from your  Dexterity modifier also becomes +3 instead of +2.
Mobile	Your Movement Speed increases by 3 m / 10 ft. When you use the Dash action, difficult terrain doesn't slow you down. If you move after making a melee attack, you don't provoke an Opportunity Attack from that target.
Moderately Armoured	(Requires  Light armour Proficiency) Increase your  Strength or  Dexterity by 1, to a maximum of 20. Gain Proficiency with  Medium armour and  Shields.
Performer	Increase your  Charisma by 1, to a maximum of 20. Gain Musical Instrument Proficiency.
Polearm Master	When attacking with a  Glaive,  Halberd,  Quarterstaff, or  Spear, you can use a Bonus Action to attack with the butt of your weapon. This attack uses the same ability modifier as the primary attack. The weapon's damage die for this attack is a d4, and it deals bludgeoning damage. (NOTE: Currently bugged and does not add bonus damage from sources other than the ability modifier.) You can also make an Opportunity Attack when a target comes within range.
Resilient	You increase an Ability by 1, to a maximum of 20. Gain Proficiency in that ability's Saving throws. Ability choices are 1 of the following:  Strength  Dexterity  Constitution  Intelligence  Wisdom  Charisma
Ritual Caster	You learn two ritual Spells of your choice.
Savage Attacker	When making weapon attacks, you roll your damage dice twice and use the highest result.
Sentinel	When an enemy in melee range attacks an ally, you can use a Reaction to make a weapon attack against that enemy. Target ally must not have the Sentinel feat. You gain Advantage on Opportunity Attacks, and when you hit a creature with an opportunity attack, it can no longer move for the rest of its turn.
Sharpshooter	Your ranged weapon attacks are not penalized for High Ground Rules. Ranged weapon attacks with weapons you are Proficient with have a -5 penalty to their Attack roll, but deal an additional 10 damage. (This is a toggleable passive effect)
Shield Master	Gain a +2 bonus to  Dexterity Saving throws when wielding a Shield. If a Spell forces you to make a dexterity saving throw, you can use your Reaction to shield yourself and diminish the effect's damage. On a failed save, you only take half damage. On a successful save, you don't take any damage, even if you normally would.
Skilled	You gain Proficiency in 3 Skills of your choice.
Spell Sniper	You learn a cantrip, and the number you need to roll a Critical Hit while attacking with a Spell is reduced by 1. This effect can stack.
Tavern Brawler	Increase your  Strength or  Constitution by 1, to a maximum of 20. When you make an unarmed attack, use an improvised weapon, or throw something, your strength modifier is added twice to the damage and Attack rolls.
Tough	Hit Point maximum increased by 2 for each level.
War Caster	You gain Advantage on Saving throws to maintain  Concentration on a Spell. You can also use a Reaction to cast Shocking Grasp at a target moving out of melee range.
Weapon Master	Increase your  Strength or  Dexterity by 1, to a maximum of 20. Gain Proficiency with four Weapon types of your choice.

Trivia

• Some feats were changed from their D&D 5e counterparts. For a detailed comparison see D&D 5e Feat Changes.