While wearing just dwarven leathers no shield: 25% immunity Slash/15 pierce resistence the combat log would register 15 pierce resistance twice.
Combat log would say
Damage resistance 15
Damage resistance 15
Netyan'nis damages Netya'nis (0)
When wearing death chain and using IA peirce shield (which is 25% slash imunity/20 bldg resistance armor and the shield is 25% pierce immunity/20 pierce resistance) the combat log registered 2 immunities and 2 resistances before any damage was felt:
Damage Immunity 21
damage immunity 21
damage resistance 20
damage resistance 20
Netya'nis damages Netya'nis (46)
is an example of what I saw in combat log. This occured on every heart beat when inside spell affect area.
If she had armor with 25% pierce immunity with the shield that last round of damage would have been even less, 23 perhaps.
With IA pierce shield and premonition, Netya'nis stood inside the spell from beginning to end and only received 53 points of damage, TOTAL!!!

