Shadowcaster

The Shadowcaster has tapped into the essence of shadow magic. Similar in nature to the Arcane Trickster, the Shadowcaster blends the powers of the rogue with the arcane, but with a more roguish twist. The Shadowcaster does not have access to the full list of spells as their cousins, but their focus on shadow magic pays off in tenfold. 

Shadow Dodge

Also at 3rd level, you gain access to the ability to fall into your shadow to avoid dire situations. As a bonus action, you may step into your shadow and teleport to an unoccupied space you can see within 25 feet of you. You may use this ability a number of times equal to your proficiency bonus before completing a long rest. 

Spellcasting

Upon selecting this archetype at 3rd level, you gain the spellacasting feature, mirroring that of the Arcane Trickster, with the following exception. You may only learn and cast spells from the Divination, Illusion, Necromancy, and Abjuration schools of magic. See PHB, p. 98, "Arcane Trickster Spellcasting" table for spell casting progressions details. 

Shadow Retribution

Starting at 9th level, if you are targeted by a damaging spell, whether it damages you or not, you may use your reaction to cast a cantrip on the caster. 

Silent Caster

Upon 13th level, you learn the ability to cast the vocal component of your spells by merely mouthing the words, without actually creating a sound. You may cast your spells without any verbal components. 

Twilight Shroud

Upon reaching 17th level, you learn the ability to wrap yourself in shadows and obscure incoming attacks against you. As a reaction to an attack (whether it would hit you or not), you may cast the Blur spell, without expending a spell slot. This effect is applied to the triggering attack as well. Once you use this feature, you can't use it again until you finish a long rest.