Corrupted Slicer

Eyeless. The Corrupted Slicer is permanently blinded.

Ambusher. The Corrupted Slicer can crawl on walls and ceilings with a speed of 25 ft. 

Agent of Prophecy. While under the effect of Song of Prophecy, Corrupted practitioner gains Spellcasting, has their Strength, Dexterity, and Wisdom scores increased by 2, and is immune to being charmed or frightened. 

Spellcasting. The Corrupted Slicer is a 3rd-level spellcaster. Its spellcasting ability is Wisdom (spell save DC 12, +3 to hit with spell attacks). The Corrupted Practitioner has the following spells prepared:
1st level (3 slots): Zephyr Strike, Fog Cloud

2nd level (2 slots): Invisibility

Spellcasting. A Corrupted Slicer may only cast spells while under the effects of a Corrupted Oracle's Song of Prophecy. 

Spineblade. Melee Weapon Attack: +7 to hit, reach 5 ft., 1 target. Hit: 8 (1d6+ 4) slashing damage plus 4 (1d6) poison damage.

Oracular Strike. While under the effects of Song of Prophecy, the Corrupted Slicer can expend a spell slot to make a melee attack with advantage. If the attack hits, it is a critical hit. expending a second level spell slot increases the damage dealt by an additional 1d6, and the Corrupted Slicer turns invisible until the end of its next turn. The invisibility effect ends of the Corrupted Slasher attacks or casts a spell. 

Offhand strike. The Corrupted Slicer makes an additional weapon attack as a bonus action 

Lurker. The Corrupted Slicer can take the dodge, dash, disengage, or hide actions as a bonus action