OneDND Thief

Making a modified version of the One DND version to work in normal 5th edition.

Fast Hands

As a Bonus Action, you can do one of the following:
     Sleight of Hand. Make a Sleight of Hand check to pick a lock, disarm a trap with Thieves’ Tools, or to pick a pocket.
     Use an Object. Take the [Tooltip Not Found] action, or take the Magic action to use a magic item that requires that action.

Second-Story Work

Climber. You gain a Climb Speed equal to your Speed. On your turn, you can move on a ceiling without making an ability check, provided there is at least one handhold during the move, but you fall if you end the turn there without a handhold.
Jumper. When you make a running jump, the distance you cover increases by an amount equal to your Dexterity modifier.

Supreme Sneak

Hidden in Plain Sight. You can make Stealth checks even if you have no cover, and you gain advantage on any Stealth checks if you have any form of cover.

Use Magic Device

You have learned enough about the workings of magic that you can improvise the use of items even when they are not intended for you. You ignore all class, race, and level requirements on the use of magic items.

If any magic item requires you to use your own spell DC, you use Intelligence as your Spellcasting Ability for the ability. If you cast a spell through a Spell Scroll, if it is a cantrip or a 1st-level spell, you can cast it reliably. If the scroll contains a higher-level spell, you must first succeed on an Arcana check with a DC equal to 10 plus the spell’s level. On a successful check, you cast the spell from the scroll. On a failed check, the scroll disintegrates.

Thief’s Reflexes

When you reach 17th level, you have become adept at laying ambushes and quickly escaping danger. You can take two turns during the first round of any combat. You take your first turn at your normal initiative and your second turn at your initiative minus 10. You can’t use this feature when you are surprised.