Ankheg	CR 3
Always N Large Magical Beast Init +0; Senses darkvision 60 ft., low-light vision, tremorsense 60 ft.; Listen +6, Spot +3 Languages —
AC 18, touch 9, flat-footed 18 (−1 size, +9 natural) hp 28 (3 HD) Fort +6, Ref +3, Will +2
Speed 30 ft., burrow 20 ft. Melee Bite +7 (2d6+7 plus 1d4 acid) Space 10 ft.; Reach 5 ft. Base Atk +3; Grp +12 Atk Options improved grab, spit acid
Abilities Str 21, Dex 10, Con 17, Int 1, Wis 13, Cha 6 Feats Alertness, Toughness Skills Climb +8, Listen +6, Spot +3 Advancement 4 HD (Large); 5-9 HD (Huge)
Improved Grab (Ex) To use this ability, an ankheg must hit with its bite attack. It can then attempt to start a grapple as a free action without provoking an attack of opportunity. If the ankheg is damaged after grabbing its prey, it retreats backward down its tunnel at its land speed (not its burrow speed), dragging the victim with it. Spit Acid (Ex) 30-ft. line, once every 6 hours; damage 4d4 acid, Reflex DC 14 half. One such attack depletes the ankheg's acid supply for 6 hours. It cannot spit acid or deal acid damage during this time. The save DC is Constitution-based. An ankheg does not use this ability unless it is desperate or frustrated. It most often spits acid when reduced to fewer than half its full normal hit points or when it has not successfully grabbed an opponent.

Ankheg

CR 3

Always N Large Magical Beast

Init +0; Senses darkvision 60 ft., low-light vision, tremorsense 60 ft.; Listen +6, Spot +3

Languages —

AC 18, touch 9, flat-footed 18
(−1 size, +9 natural)

hp 28 (3 HD)

Fort +6, Ref +3, Will +2

Speed 30 ft., burrow 20 ft.

Melee Bite +7 (2d6+7 plus 1d4 acid)

Space 10 ft.; Reach 5 ft.

Base Atk +3; Grp +12

Atk Options improved grab, spit acid

Abilities Str 21, Dex 10, Con 17, Int 1, Wis 13, Cha 6

Feats Alertness, Toughness

Skills Climb +8, Listen +6, Spot +3

Advancement 4 HD (Large); 5-9 HD (Huge)

Improved Grab (Ex) To use this ability, an ankheg must hit with its bite attack. It can then attempt to start a grapple as a free action without provoking an attack of opportunity. If the ankheg is damaged after grabbing its prey, it retreats backward down its tunnel at its land speed (not its burrow speed), dragging the victim with it.

Spit Acid (Ex) 30-ft. line, once every 6 hours; damage 4d4 acid, Reflex DC 14 half. One such attack depletes the ankheg's acid supply for 6 hours. It cannot spit acid or deal acid damage during this time. The save DC is Constitution-based.

An ankheg does not use this ability unless it is desperate or frustrated. It most often spits acid when reduced to fewer than half its full normal hit points or when it has not successfully grabbed an opponent.