AvatarVecna's Unholy Summoning
9th-level necromancy (ritual)

Casting Time: 1 hour
Range: Touch
Components: V, S, M (Unholy relics, symbols, incense and candles worth at least 2,000gp, which the spell consumes)
Duration: 24 hours

This vile ritual is taught by the lich-god Vecna to his most favoured servants, allowing them to summon an avatar of Vecna into their presence. It is better not to dwell on what price they must pay to gain this power.
When you cast this spell, you must target a living humanoid that is either restrained or incapacitated for the duration. Once the casting is complete, the target must make a Charisma saving throw; on a failure the target becomes host for a piece of Vecna's spirit. They have disadvantage on the save if they are incapacitated. While possessed, the taget's game statistics (except for appearance and size category) are replaced by those of a lich - note that this spell does not provide a phylactery, so the Rejuvenation feature does not function. The DM has the avatar's statistics.
The avatar has the personality and alignment of Vecna, but is an independent being and not under his direct control. It is friendly towards the summoner and generally willing to aid them in their endeavours.
If the avatar is destroyed, Vecna's spirit leaves the host, who then drops to 0 hit points and must start making death saves. If the spell's duration expires before this, Vecna's spirit again leaves the host, but they unharmed and have no recollection of the last 24 hours.


Grod_The_Giant's Awesome Power
1st-level transmutation

Casting Time: 1 action
Range: 30 feet
Components: V, S, M (a giant's toe)
Duration: Concentration, up to 1 minute

Choose a willing creature within you can see within range. Its Strength score is changed to 21 for the duration. If its Strength was already higher than this, the spell has no effect.
At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the target's Strength score is set to a value equal to 20 + the slot level used.