Knowledge (arcane lore) DC: 34; Range: Medium; Target: One living creature; Duration: Instantaneous; Saving Throw: Fortitude partial; Spell Resistance: Yes An incantation developed using the slay seed snuffs out the life force of a living creature, killing it instantly. The slay seed kills a creature of up to 20 HD. The subject is entitled to a Fortitude saving throw to survive the attack. If the save is successful, it instead takes 4d6 points of damage. For each additional 20 HD affected (or each additional creature affected), increase the Knowledge (arcane lore) check DC by +8.
Alternatively, you can use the slay seed in an incantation to suppress the life force of the target by bestowing 2d4 negative levels on the target (the incantation bestows half as many negative levels on a successful Fortitude save). For each additional 1d4 negative levels bestowed, increase the Knowledge (arcane lore) check DC by +4. If the subject has at least as many negative levels as Hit Dice, it dies. Assuming the subject survives, the negative levels will become permanently drained levels 24 hours later if the subject fails a Fortitude saving throw.