void Suffocation(object oCreature, int nCon, int nConMod)
{
// Check nTimer int set in OnEnter and incremented in OnHeartbeat void main()
// When the PC runs out of air (after 2 rounds per point of Constitution) start drowning process
if(GetLocalInt(oCreature, "nTimer") > (nCon * 2))
{
// Get current local int values on the PC
int nDC = GetLocalInt(oCreature, "nDC");
int nFail = GetLocalInt(oCreature, "nFail");
int nDrowning = GetLocalInt(oCreature, "nDrowning");

int nd20 = d20(); // Roll a d20

// Feedback for the player, showing the roll, modifier, DC, and success or failure
string nFeedBackPass = "You attempt to hold your breath longer. " + IntToString(nd20) + " + " + IntToString(nConMod) + " = " + IntToString(nd20 + nConMod) + " (DC " + IntToString(nDC) + ") *Success*";
string nFeedBackFail = "You attempt to hold your breath longer. " + IntToString(nd20) + " + " + IntToString(nConMod) + " = " + IntToString(nd20 + nConMod) + " (DC " + IntToString(nDC) + ") *Failure*";

// If the Constitution check was successful, send the result and increase the DC to try again next round
if((nd20 + nConMod >= nDC) && nFail != 1)
{
SendMessageToPC(oCreature, nFeedBackPass);
SetLocalInt(oCreature, "nDC", nDC + 1);
}

// If the check fails, send the result and set the local int nFail to 1
if((nd20 + nConMod < nDC) && nFail != 1)
{
SendMessageToPC(oCreature, nFeedBackFail);
SetLocalInt(oCreature, "nFail", 1);
}

nFail = GetLocalInt(oCreature, "nFail"); // Update nFail

// Drowning after failing a Constitution check lasts for three rounds:
// Round 1 - PC has hitpoints set to 0, and has fallen unconscious
// Round 2 - PC is completely out of oxygen abd begins taking in water
// Round 3 - PC dies from suffocation
if(nFail == 1)
{
switch(nDrowning)
{
case 0:
SetLocalInt(oCreature, "nDrowning", 1);
while(GetCurrentHitPoints(oCreature) > 0)
{
ApplyEffectToObject(DURATION_TYPE_INSTANT, EffectDamage(GetCurrentHitPoints(oCreature)), oCreature);
}
SendMessageToPC(oCreature, "You have fallen unconscious due to lack of oxygen.");
break;
case 1:
ApplyEffectToObject(DURATION_TYPE_INSTANT, EffectDamage(1), oCreature);
SetLocalInt(oCreature, "nDrowning", 2);
SendMessageToPC(oCreature, "Your lungs begin to fill with water.");
break;
case 2:
ApplyEffectToObject(DURATION_TYPE_INSTANT, EffectDamage(20), oCreature);
SendMessageToPC(oCreature, "You have drowned.");

// Reset local ints on PC after death
SetLocalInt(oCreature, "nDC", 10);
SetLocalInt(oCreature, "nFail", 0);
SetLocalInt(oCreature, "nDrowning", 0);
SetLocalInt(oCreature, "nTimer", 0);
break;
}
}
return;
}
}