While this Gold coin is on your person, you gain a +1 bonus to ability checks and saving throws.

While attuned to the coin you gain the following benefits depending on your rogue subclass.

Arcane Trickster

you gain a bonus to spell attack rolls and the saving throw DCs of your spells. The bonus is determined by your rogue levels, +1 at level 5, +2 at level 10, +3 at level 14.

Assassin

Now you are at your deadliest when you get the drop on your enemies. You have advantage on attack rolls against any creature that hasn't taken a turn in the combat yet. In addition, any hit you score against a creature that would be surprised is a critical hit.

Inquisitive

You can use your Insightful Fighting feature as part of your steady aim optional feature and if you if you succeed you can use your Sneak Attack against that target even if you have disadvantage on it.

Master Mind

You can use your Master of Tactics as part of your steady aim optional feature.

Phantom

your Wails from the Grave feature now benefits from critical strikes.

Scout

You can spend 10 minutes creating camouflage for yourself using your disguise kit. You must have access to fresh mud, dirt, plants, soot, or other naturally occurring materials with which to create your camouflage according to your surroundings (DMs discretion). Once you are camouflaged in this way and take the hide action you gain a bonus to Dexterity (Stealth) checks equal to you disguise kit proficiency proficiency. this last a number of minutes equal to you wisdom modifier.

SoulKnife

you gain a bonus to attack rolls and the damage roll of your Psychic Blades feature. The bonus is determined by your rogue levels, +1 at level 5, +2 at level 10, +3 at level 14.

Swashbuckler

you have advantage on initiative rolls and Charisma (Persuasion) checks.

Thief

When you used your Action to make a Dexterity (Sleight of Hand) check, use your thieves' tools to disarm a trap or open a lock you advantage on the roll.

Notes: Bonus: Ability Checks, Bonus: Saving Throws, Bonus: Initiative, Requires Attunement by a rogue registered in the AA(assassin association), Buff