Pernicious Poison

2nd-level necromancy

Casting Time: 1 action

Range: Touch

Components: V, S

Duration: Concentration, up to 10 minutes

You weaken the target’s defenses against poison.

On a failed Constitution saving throw the target has disadvantage on saving throws against poison, and poisons affecting the target are more virulent increasing the damage die by 1 (for example, 1d8 becomes 2d8).

If the Constitution saving throw is failed, another should be made, if this also failed the target loses resistance to poison (if it had any) and any poison immunity is reduced to poison resistance.