Mountain Turtle (CR 1?)

Mountain Turtle CR 1
XP 400
Mountain turtle vanguard [Alien Archive 2 140]
N Small animal (earth)
Init +1; Senses low-light vision; Perception +5
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Defense HP 20
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EAC 11; KAC 13
Fort +3; Ref +3; Will +1
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Offense
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Speed 30 ft.
Melee entropic strike +5 (1d3+5 A & B; operative)
Ranged rock blast +8 (1d6+3 B; thrown [10 ft.])
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Statistics
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Str +2; Dex +1; Con +4; Int -4; Wis +0; Cha +0
Skills Acrobatics +5, Athletics +5, Intimidate +7, Stealth +5, Survival +10
Feats Improved Combat Maneuver (trip)
Other Abilities entropic pool[COM], entropic strike[COM], evolution
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Special Abilities
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Evolution – At the end of its turn after defeating a PC, the mountain turtle grows a cocoon of bright light around it and is impervious to all damage. The turtle stays in its cocoon for 1 full round, and at the beginning of its second turn, the cocoon breaks open, revealing the Mountain Tortoise that the Mountain Turtle has transformed into. The Mountain Tortoise still has the same damage and conditions that it had before the evolution.

Rock Blast – The mountain turtle has a close connection to the earth, allowing it to blast rocks at its enemies. Rock Blast has a range increment equal to the turtle’s Strength modifier × 5 feet. Such attacks also create difficult terrain in a 5-foot-radius area around the target, or a 10-foot-radius area for Huge and larger turtles.