Protection Rings
Those Mercenaries had some nice stuff.
Of course there wasn't anything that impressive considering they were only D ranked at most but they were still interesting nonetheless.
I've found that they were able to resist the paralysis thanks to a few rings they were wearing on their fingers.
[Minor Protection Ring (Paralysis, Poison) - Provides wearer with minor protection from paralysis and poison effects.]
Not bad, the fact that these were able to resist against [Static Bolt] and [Static Shock] was enough to prove its usefulness.
As for the ones who were affected by my paralysis spells, it was because they were wearing protection rings of a different kind.
[Minor Protection Ring (Blindness, Hypnotic) - Provides wearer with minor protection from blindness and mind altering effects.]