Decrepit Skeleton
Medium natural animate (undead)
Level 1 Minion Skirmisher XP 25
Initiative +5 Senses Perception +2; darkvision
HP 1; a missed attack never damages a minion.
AC 16; Fortitude 13, Reflex 14, Will 13
Speed 6; Immune disease, poison; Resist 10 necrotic; Vulnerable 5 radiant
Longsword (weapon) 
At-Will
Effect: The skeleton can shift 1 square before the attack
Attack: Melee 1 (one creature); +6 vs. AC
Hit: 4 damage.
Shortbow (weapon) At-Will
Effect: The skeleton can shift 1 square before the attack
Attack: Ranged 20 (one creature); +6 vs. AC
Hit: 3 damage.
Str 15 (+2) Dex 17 (+3) Wis 14 (+2)
Con 13 (+1) Int 3 (-4) Cha 3 (-4)
Alignment unaligned Languages -
Equipment: arrow x20, longsword, shortbow.
First published in Monster Manual, page(s) 234.