ne medium mindless undead zombie 

Perception +2; darkvision

Skills Athletics +5, Stealth +5

Str +3 Dex +1 Con +2 Int -5 Wis +0 Cha -2

Slow A zombie snake is permanently slowed 1 and can't use reactions.

AC  13; Fort +6, Ref +3, Will +2

HP 35, negative healing; Immunities death effects, disease, mental, paralyzed, poison, unconscious; Weaknesses positive 5, slashing 5

Speed 20 feet, climb 20 feet

Melee [>] fangs +7, Damage 1d6+3 piercing plus filth fever

Filth Fever (disease) The sickened and unconscious conditions from filth fever can't end or be reduced until the disease is cured;

Saving Throw DC 14 Fortitude; Stage 1 carrier with no ill effect (1d4 hours); Stage 2 sickened 1 (1 day); Stage 3 sickened 1 and slowed 1 (1 day); Stage 4 unconscious (1 day); Stage 5 dead

Book of the Dead, page 170.