Wondrous Item

Legendary Requires Attunement

While attuned to the codex, you gain a +1 bonus to concentration check saving throws. You can also use an action to regain spell slots. Once per day, you may spend Hit Dice equal to the spell slot level you wish to regain, up to maximum of 5 Hit Dice.  

Awakened

When a character awakens this item, apply the following changes to the item's traits.

Increase the bonus to concentration check saving throws to +2

Temporal Expedition (1/day): As a reaction, you may choose a target. If the target is friendly, their initiative instantly becomes 20. If the target is hostile, their initiative instantly becomes 1, if they fail a Wisdom saving throw to resist.

Exalted

When a character exalts this item, apply the following changes to the item's traits.

Increase the bonus to concentration check saving throws to +3

You cease aging. If for any reason you lose possession of the Chronos Codex or chose to unattune, your lost years rush back as you rapidly age to reflect your true age. No form of magic can prevent the re-aging process.

Summon Past Self (1/day): As a bonus action, you reach into time's manifold and summon yourself from the past. Your past self will assist you by casting one spell from your class spell list. Roll 1d4 and subtract the roll from 6 with the final number being the maximum spell level your past self may cast. Your past self is not under your control but it is a version of you and will assist you. Because of this, the GM decides which beneficial spell to cast from your class spell list after the spell level is calculated. Your past self uses your current spell attack and spell save DC for the spell and disappears at the end of your turn. The past self cannot speak or take damage and appears ethereal. The spell cast does not detract from the players spell slot total and is not considered cast from the player. (Player may still use an action to cast a spell other than a cantrip this turn.)

GM Rule: While attuned to the book, the GM may ask you to roll a d20 at their choosing. If you roll a 1, you disappear for 6 seconds or 1 round of combat, as you are pulled backward or forward in time to assist yourself in an alternate timeline.