Deadlier than Arsenic

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Deadlier than Arsenic is a Level 4 Evocation Spell. It is a variant of Kereska's Favour that allows its caster to imbue themselves with the power of poison and unlock resistances and spells associated with it. It is granted by Markoheshkir.


Embrace Kereska's poison to gain Resistance to Poison damage. Your Poison spells deal additional Poison damage equal to your Proficiency Bonus.

When you deal spell damage, inflict 1 turn of PoisonedPoisoned upon the target. While attuned to Kereska's poison you can cast Cloudkill Cloudkill and Ray of Sickness Ray of Sickness once each per Short Rest.


Recharge: Short rest

At higher levels

Casting this spell at a higher level grants no additional benefit.

Condition: Vessel for Kereska's Poison

Vessel for Kereska's PoisonVessel for Kereska's Poison
Duration: Until Long rest

How to learn

This spell is a variation of:
Kereska's Favour Kereska's Favour


  • Despite the tooltip claiming it inflicts 1 turn of Poisoned, it actually inflicts 2 turns.