Apparently, it blocks 2 of every icon except physical.
So, if a pet had 700 strength, it would defend 15 x 2 = 30 of every icon except physical.
If a super attack pea is used, the 20 earth and 12 air would both be negated.
If a seasonal attack pea is used, both the 20 earth and 8 light would be negated as well.
And so on and on and on...
So why do neopians prefer the ghostkershield/tabard over this when you can be almost invincible if you use this?