Medium (Magical Beast) CR 6
HP 68, hd8d10+24 AC 17 (+2 Dex, +5 natural), touch 12, flat-fooded 15 Fort +9, Ref +10, Will +3 Speed 60 ft. (12 squares) Initiative +6 Spot , Listen
Standard attacks BAB +8, Grapple +11
Attacks
Full attack: Claw +11 melee (1d8+4)
Special Attacks/Qualities
Acid spray
Darkvision 60 ft., immunity to acid, low-light vision, scent
Skills Hide +9, Listen +6, Jump +21, Spot +6
Feats Alertness, Improved Initiative, Lightning Reflexes
Str 17 Con 17 Dex 15 Int 2 Wis 12 Cha 10
Alignment Always neutral, Environment Warm forests, Organisation Solitary or pack (3?6)

A digester stands about 5 feet tall and is 7 feet long from snout to tail. It weighs about 350 pounds,

A digester is a hunting and eating machine. When it is not hungry (which is rarely), it lies low and avoids most other creatures. When hunting, it looks about for a likely target, then charges forth and delivers a gout of acid. If the initial attack is insufficient to kill the prey, the digester attacks with its hind feet until it can spray acid again.
Acid Spray (Ex): A digester can spray acid in a 20-foot cone, dealing 4d8 points of damage to everything in the area. Once a digester uses this ability, it can?t use it again until 1d4 rounds later.
The creature can also produce a concentrated stream of acid that deals 8d8 points of damage to a single target within 5 feet. In either case, a DC 17 Reflex save halves the damage. The save DC is Consitution-based.
Skills: A digester?s coloration gives it a +4 racial bonus on Hide checks. It also has a +4 racial bonus on Jump checks.

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System Reference Document -> List of Creatures (SRD)