Here is how I would go about it...
[sblock]
Wight Minion
Medium natural humanoid (undead)
Level 5 Minion
XP 50
Initiative +7 Senses Perception +0; darkvision
HP 1; a missed attack never damages a minion.
AC 19; Fortitude 18, Reflex 17, Will 16
Immune disease, poison; Resist 10 necrotic;
Speed 7
Traits
Necrotic dispersal
When a wight minion is destroyed, adjacent creatures take 3 necrotic damage
Standard Actions
m Claw (standard, at-will) Necrotic
Attack: Melee 1 (one creature); +10 vs. AC
Hit: 7 necrotic damage, the wight shifts 1 square.
Alignment Evil Languages Common
Skills Stealth +10
Str 18 (+6) Dex 16 (+5) Wis 6 (0)
Con 14 (+4) Int 10 (+2) Cha 15 (+4)
Ghoul
Medium natural humanoid (undead)
Level 5 Minion
XP 50
HP 1; a missed attack never damages a minion. Initiative +8
AC 19, Fortitude 17, Reflex 19, Will 16 Perception+2
Speed 8, climb 4 Darkvision
Immune disease, poison; Resist 10 necrotic
Traits
Paralytic Stench * aura 1
Enemies who start their turn in the aura are slowed until the end of their turn.
Standard Actions
m Claws At-Will
Attack: Melee 1 (one creature); +10 vs. AC
Hit: 8 damage.
Skills Stealth +11
Str 14 (+4) Dex 19 (+6) Wis 11 (+2)
Con 15 (+4) Int 10 (+2) Cha 12 (+3)
Alignment chaotic evil Languages Common
[/sblock]
Makes them simple to run as minions should be, yet with just a touch of the right flavor.