Poisons, whether magical or non-magical, can make any encounter deadly.
If used against defenseless targets, poisons are usually unstoppable.
Certain magical means provide some degree of protection against this type
of attack. One such mean casts a magical aura over the target which allows
one some resistance and immunity to poisonous attacks. While it doesn't
make one completely immune, it does help alot, and may be the difference
between victory and defeat.
Toxic dilution is available in the following guild: