Vecna

Dungeons & Dragons · Tabletop · God of Secrets, Lich, Former Human, Wizard

Demigod

Tier: HIGH 6-A
Attack Potency: Multi-Continent Level
Speed: Ftl, up to Ftl+
Durability: Multi-Continent Level

Lesser God

Tier: 2-C
Attack Potency: Low Multiverse Level
Speed: Infinite
Durability: Low Multiverse Level

Greater God and boosted By The Serpent

Tier: 2-A
Attack Potency: Multiverse Level+
Speed: Infinite
Durability: Multiverse Level+

Powers and abilities

Superhuman Physical Characteristics
Telekinesis
Astral Projection
Cold Manipulation
Poison Manipulation
Can become invisible
Banishment
Weather Manipulation
Elemental Manipulation (Fire, Air, Earth, and Water) Spell Drain
Perception Manipulation (Can block the senses of other deities, I:E: can block extrasensory perception)
Demiplane
Status Effect Inducement (Can cause "stunning", uncontrollable dancing, uncontrollable laughter, etc)
Gravity Manipulation
Truesight (Lets him see through illusions, natural and magical illusions, know the original form of shapeshifters, and see souls and concepts)
Automatically knows any secret that affects more than 500 people
Lifeforce Absorption
Causality Manipulation (Using the wish spell)
Memory Manipulation
Imprisonment Spells allows you to put someone in eternal sleep
create a pocket reality warded against Multiversal+ range
trap them in a gemstone
lock them in a magical sphere that can't be teleported out of
or lock them in chains that block movement and all abilities
Portal Creation
Teleportation
Fear Manipulation
Illusion Creation
Matter Manipulation
Petrification
Dream Manipulation
Necromancy
Magic
Space-Time Manipulation
Death Manipulation
Reality Warping
Regeneration (Mid-Godly, all gods can regenerate from being destroyed by the sphere of annihilation, which destroys something on all levels of existence, including the soul)
Immortality (Types 1, 2, 3, 7, 8. Avatars possess 6 and 9)
Abstract Existence (Type 1; reliant on the concept of secrets)
Conceptual Manipulation (Type 1; gods are the personification of various universal concepts- while lesser beings embody these, gods truly are equatable to their concepts. In the case of Vecna, he is the concept of secrets and intrigue)
Possession

Weaknesses

The Sword of Kas is capable of nullifying his Regeneration and immortality, but this is unlikely to come up in a fight as the sword is unreplicable

Ranked tied for #8 of 704 in Dungeons & Dragons by strength.

Close fights from other series

Vecna vs Old Man Logan (Marvel · Tier LOW 1-C): Too close to call
Vecna vs Human SOULs (Undertale · Tier LOW 1-C): Human SOULs · Slight edge
Vecna vs Chronosapien Time Bomb (Ben 10 · Tier LOW 1-C): Chronosapien Time Bomb · Slight edge
Vecna vs BanchoLilimon (Digimon · Tier LOW 1-C): Vecna · Slight edge
Vecna vs Madoka Kaname (Puella Magi Verse · Tier 2-A): Madoka Kaname · Slight edge
Vecna vs Flash (Barry Allen) (Post-Crisis) (DC · Tier 2-A): Vecna · Slight edge
Vecna vs Ultimecia (Final Fantasy · Tier 2-A): Vecna · Slight edge
Vecna vs Savanti Romero (Mirage Comics) (Teenage Mutant Ninja Turtles · Tier 2-A): Too close to call

Compare Vecna with another character · Vecna on the VS Battles Wiki