An Epic Boon, as per the DMG, page 232. A new Feat/ASI, as per the PHB page 165, although at epic levels the player is no longer restricted in how many times they may take a feat.
D&D 5e Epic Boons by IronRule - Created with GM Binder. Class Specific BARBARIAN BOON OF THE RAVAGER. Title Gained: Ravager At the very start of your turn, even if you cannot act but as long as you have 1 hit point or more and are raging, you are cured of 1 condition of your choice currently afflicting you and gain 10 hit points.

The missing index from the Dungeon Master's Guide 5th edition: magic items by category.

The missing index from the Dungeon Master's Guide for 5e

This index contains the magic items from the Dungeon Master's Guide grouped according to their category.

Armor

Name	DMG page
Adamantine Armor	150
Animated Shield	151
Armor, +1, +2, or +3	152
Armor of Invulnerability	152
Armor of Resistance	152
Armor of Vulnerability	152
Arrow-Catching Shield	152
Demon Armor	165
Dragon Scale Mail	165
Dwarven Plate	167
Efreeti Chain	167
Elven Chain	168
Glamoured Studded Leather	172
Mariner's Armor	181
Mithral Armor	182
Plate Armor of Etherealness	185
Sentinel Shield	199
Shield, +1, +2, or +3	200
Shield of Missile Attraction	200
Spellguard Shield	201

Potions

Name	DMG page
Scroll of Protection	199
Spell Scroll	200

Name	DMG page
Staff of Charming	201
Staff of Fire	201
Staff of Frost	202
Staff of Healing	202
Staff of Power	202
Staff of Striking	203
Staff of Swarming Insects	203
Staff of the Adder	203
Staff of the Magi	203
Staff of the Python	204
Staff of the Woodlands	204
Staff of Thunder and Lightning	204
Staff of Withering	205

Name	DMG page
Alchemy Jug	150
Amulet of Health	150