Syntax:

addaffect( where<"affects">, type, level, duration, location, modifier, bitvector )
addaffect( where<"affects">, "custom_affect", level, duration, location, modifier, bitvector, customtag )
addaffect( where<"immune"|"resist"|"vuln">, type, level, duration, bitvector )
addaffect( where<"immune"|"resist"|"vuln">, "custom_affect", level, duration, bitvector, customtag )

Arguments:

where - As indicated, could be affects, immune, resist, or vuln.
type  - Skill name or "custom_affect" ( see skill_table )
level - Integer.
duration - Integer. Duration in ticks, -1 for indefinite.
location - What does it affect ( see apply_flags table ).
modifier - How much does it affect, i.e. skills -100)
bitvector - Affect flag to add ( see affect_flags table ).
customtag - String. Custom name for the affect. This is what will show with 'affects' command.

Example1:

--------------where--------type---------lvl--dur--location--mod--bitvec---custom-tag
ch:addaffect("affects","custom_affect", 100, -1, "skills", -100, "none", "Irena's curse")
ch:addaffect("affects","custom_affect", 100, -1, "stats", -100, "none", "Irena's curse")

You are affected by the following spells:
Special: Irena's curse : modifies all stats by -100 indefinitely (Lvl 100)
                       : modifies all skills by -100 indefinitely (Lvl 100)

Example2:

--------------where--------type------lvl--dur-loc--mod--bitv
ch:addaffect( "affects", "paroxysm", 100, 1, "none", 0, "none")

You are affected by the following spells:
Ability: paroxysm       : modifies none by 0 for 1 hours (Lvl 99)

Example 3:

-----------where-------type--------lvl--dur---bitv---customtag
​addaffect("vuln", "custom_affect", 100, 100, "fire", "Scorched skin")

Special: Scorched skin  : modifies none by 0 for 100 hours (Lvl 100)