| Conviction breaks immunities by lowering the elemental resistances at 1/5 effectiveness. Poison is not elemental. Conviction has no effect on immunity to poison.
Lower resist, even on its own, can break immunities. Against immunes it only functions at 1/5 effectiveness. For example, your lower resist is -60%, and a poison immune monster has 110 resistance. Lower resist will lower the target's poison resistance by 60%/5% = 12%. The monster will then have 98% resistance to poison, losing the immunity. Conviction, having nothing to do with poison at all, will not make a difference. |