Poison

[Lelik]

Being immune to poison you can catch 'poison' spell affect and message every tick:

You shiver and suffer.
You are unaffected by your poison.

It's quite possible we have the same story with immune to disease and plague.

[Sirri]

Keeping it for now (you can lose your magical immunity and then the poison should kick in)

[Lelik]

Keeping it for now (you can lose your magical immunity and then the poison should kick in)

So  strength decreasing should also appears when you lose your magical immunity)))

[Earwin]

Keeping it for now (you can lose your magical immunity and then the poison should kick in)

'tis a bit of a mess
AFAIR we have three kinds of poison immunity — 100% resists, mob immunities, specials
and multiple ways of applying poison, some of which check some of the immunities, while others don't.

when you're poisoned & immune, poison still affects strength and probably recovery (of this I'm not sure)

what's more fun, you can poison yourself on purpose with a weak poison to avoid being poisoned for realz by a hard-hitting mob. logic dictates if combining poisons is out of the picture for mechanics/balance purposes, it should at least upgrade the strength to max out of two