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Did You mean this spell? It is "poison skull" from chaos magic, it takes 5, 7 or 10 mana at diferent levels and makes poison damage both at the moment of spelling and in the few next turns. The one-time damage depends on intellect and has big variation for example 315-1100 at level 1, 565-1985 at second and 820-2865 at level 3. The contionuos harm is 70, 100 and 100 % and I understand this values not very clear but You have to know that it takes off the part of summary health of all stack so one last pirate (for example) can stay alive but 100 pirates will lose 5-10 as perishing.