Most roguish individuals chose a path, that leads them down thievery, assassination, scouting or a small portion of arcane dabbling. 

Nonetheless, there are a handful of those that walk the path of faith. However, this faith may result in the creation of either a cultish killer or a fervent defender of the innocent. These people are not just capable of using daggers and hide in the dark, but also draw upon their faith like some Clerics or Paladins do.

Spellcasting

When you reach 3rd level, you become able to cast cleric Spells.

Cantrips

You learn 3 cantrips: Guidance and two additional cleric cantrips. You learn another Cleric cantrip of your choice when reaching 10th Level.

The Acolyte of Shadow works the same way as an Arcane Trickster, with the difference that they learn their Spells from the Cleric Spell List and use Wisdom as Spellcasting Ability Modifier. Additionally, when they learn news Spells, they have to come from the divination or abjuration school.

 

Guided by Faith

Starting at 3rd level, you can cast Guidance without using Somatic and Verbal components.

In addition, you can use the bonus action granted by your Cunning Action to cast this Spell and the d4 becomes a d6.

Driven by Purpose

Starting at 9th level, your Sneak Attack damage die now deals either necrotic or radiant damage, depending on your Alignment (Necrotic for Evil and Radiant for Good).

Unwavering Believe

At 13th level, you gain the ability to ignore the Verbal components of Cleric Spells you can cast. Additionally, when hitting with a weapon attack you can expend a Spell Slot to deal an additional 1d8 radiant or necrotic damage depending on the alignment of your deity. You deal an additional 1d8 damage for every Spell Slot above 1st. If you are neutral you can choose any of these two.

Gift of the Gods

Starting at 9th Level you gain a single blessing of the deity you are worshiping depending on the Alignment of that deity.

Evil Alignment

Choose one of those Spells if your deity is Evil aligned.

Good Alignment

Choose from these Spells if your deity is Good aligned.

Neutral Alignment

Choose one of those Spells if your deity is Neutrally aligned. Ceremony is the other spell, however it is not in this dropdown menu due to licensing issues. Therefore the other choice is Fireball, as a placeholder for Ceremony.

Acolyte of the Divine

Starting at 13th Level, the characters soul is so infused with divine energies, that they reform his Soul. For the purpose of magic Items, the character counts as both a Paladin and a Cleric.

Additional Gift of the Gods

Starting at 17th level you gain an additional Gift of the Gods depending on your deities alignment.

Evil Alignment

Choose one of these gifts if your deity is Evil aligned.

Good Alignment

Choose one of these gifts if your deity is Good aligned.

Neutral Alignment

Choose one of these gifts if your deity is Neutrally aligned.

Divine Purpose

The character is filled with divine purpose and determination. He adds his Wisdom Modifier to all of his Saving Throws as well as attack rolls.