Secondary

B35 describes:
:If an Affliction produces two or more effects due to the special enhancements below, some of these effects may be secondary. Secondary effects occur only if the victim fails his HT roll by 5 or more or rolls a critical failure. A secondary effect is worth 1/5 as much
The example used "Secondary Heart Attack" recurs on page 139 of GURPS Powers, while "Secondary Coma" appears on 144.
Electrified Skin must retain the inherent Stun as the primary effect. even though it doesn't pay for Stunning (enhancement), which only specifies:
*Advantage (enhancement)
*Attribute Penalty
*Disadvantage (enhancement)
*Negated Advantage
B35 mentions "If your Affliction causes an effect other than stunning, this is a special enhancement" which makes it sound like the stun is lost in all cases, Electrified Skin is a contraindication.
Paralytic Venom on the other hand, does buy Paralysis as a primary effect and there is no mention of stunning. So a free stun might only be obtained if it remains the only primary effect.
==See also==
*Secondary Characteristics
Category:Enhancements