This brown lengthy, segmented horror writhes and twists, pulsing its venomous mandibles in search of prey.
As a summoned, template, creature, this creature has several changes. Anything noted with  is what it gains from the template associated with the summoners’ alignment. Divine is always listed first, and Unholy afterwards.
AC 14, touch 12, flat-footed 12 (+2 dex, +2 natural)
hp 8  (1d8+4)
Fort +3, Ref +2, Will +0
Immune mind-affecting effects;
Resist earth 5 [holy 5/shadow 5]
Weakness Ice [shadow/holy]
Speed 40 ft. [50 ft], Climb 40 ft. [50 ft]
Melee Bite +2 (1d6-1 [+1 holy/shadow] plus poison)
Special Attacks Critical Attack
Str 9, Dex 15, Con 12, Int -, Wis 10, Cha 2
Base Atk +0; CMB -1; CMD 11 (can’t be tripped)
Feats Toughness*, Weapon Finesse
Skills Climb +10, Perception +4, Stealth +10; Racial Modifiers +4 Perception, +8 Stealth
Critical Attack (Ex)
Once per day as a standard action, the centipede can inflict more pain than normal. If they succeed at hitting with their bite attack, the damage is 1d6-1 x 1.5 for total damage.
Bite — injury; save Fort DC 13; frequency 1/round for 6 rounds; effect 1d2 non-elemental damage; cure 1 save. The save DC is Constitution-based and includes a +2 racial bonus.