Agreed. No Con damage.
While I'm not adamantly opposed to the Heal check, I don't think it's necessary.
So just default to the standard Heal checks to treat poison, then?
If I understand things right, the current proposal might look something like:
Poison #1: Gonyaulax produce a cloud of poison, any creature in the water that occupies the same 5 ft. square as a Gonyaulax is exposed to its poison.
Gonyaulax poison—Contact/inhaled poison, Fort DC 6, initial damage 1 Dex, secondary damage 1 Dex. If the poison reduces a victim's Dexterity to 0 the victim starts to suffocate and must make Constitution checks every round to avoid drowning (DC 10 plus 1 per round). The save DC is Constitution-based and includes a -4 racial penalty.
Poison: Gonyaulax swarms produce a cloud of poison, any creature in the water within 30 ft. of a Gonyaulax swarm is exposed to its poison.
Gonyaulax swarm poison—Contact/inhaled poison, Fort DC 12, initial damage 1d6 Dex, secondary damage 1d6 Dex. If the poison reduces a victim's Dexterity to 0 the victim starts to suffocate and must make Constitution checks every round to avoid drowning (DC 10 plus 1 per round). The save DC is Constitution-based and includes a -4 racial penalty.
Hmm, maybe it would work better to modify the rules for Slow Suffocation. I'd change the 1d6 per 15 minutes to 1d6 per minute:
Poison: Gonyaulax produce a cloud of poison, any creature in the water that occupies the same 5 ft. square as a Gonyaulax is exposed to its poison.
Gonyaulax poison—Contact/inhaled poison, Fort DC 6, initial damage 1 Dex, secondary damage 1. If the poison reduces a victim's Dexterity to 0 the victim starts to die from slow suffocation, taking 1d6 nonlethal damage every minute, characters who fall unconscious drop to -1 hit points and are dying, then suffocate to death the next round. The save DC is Constitution-based and includes a -4 racial penalty.
The
Gonyaulax swarm poison is the same except its 1d6/1d6 damage Dex with DC12.