Arch Poison/Acid Rakshasa

Greater Magic Resistance. The rakshasa automatically succeeds on saving throws against spells and other magical effects, and the attack rolls of spells automatically miss it. Without the rakshasa’s permission, no spell can observe the rakshasa remotely or detect its thoughts, creature type, or alignment.

Fiendish Restoration. If the rakshasa dies outside the Nine Hells, its body turns to ichor, and it gains a new body instantly, reviving with all its Hit Points somewhere in the Nine Hells.

Arch acid/poison Mage. this cretcther is resiztent to poison and acid damage and all of its spells that inflict acid or poison damage deal + 1 poison/acid damage times the level of the spell (cantrips deal 0 extra damage, level 1 does plus 1, level 2 does plus 2, level 3 does plus 3 so on and so fourth this also applies to spells or magic acthions that gives a wepon poison/acid damage in the case of a magic action its plus 2 or plus 3 if thar profechitint with that wepon type) this cretcther can also cast Poison Spray or Acid Splash for free once per turn it also pasvily activates Absorb Elements if hit with poison/acid damage.

Multiattack. The rakshasa makes three Cursed Touch attacks.

Cursed Touch. Melee Attack Roll: +10, reach 5 ft. Hit: 12 (2d6 + 5) Slashing damage plus 19 (3d12) Necrotic damage. If the target is a creature, it is cursed. While cursed, the target gains no benefit from finishing a Short or Long Rest.

Baleful Command (Recharge 5–6). Wisdom Saving Throw: DC 18, each enemy in a 30-foot Emanation originating from the rakshasa. Failure: 28 (8d6) Psychic damage, and the target has the Frightened and Incapacitated conditions until the start of the rakshasa’s next turn.

Spellcasting. The rakshasa casts one of the following spells, requiring no Material components and using Charisma as the spellcasting ability (spell save DC 18):

At Will: Detect Magic, Detect Thoughts, Disguise Self, Mage Hand, Minor Illusion
1/Day Each: Fly, Invisibility, Major Image, Plane Shift, Cloudkill, Vitriolic Sphere

5/Day Each: Prismatic Wall