Stone Soldier enemy line

Stone Soldier, Boulder Beast, and Raging Rock are species of monsters found in Golden Sun and Golden Sun: The Lost Age. These monsters, resembling a spike ball with eyes and feet, are palette swaps of each other and have differing levels of power and defense. All are associated with the Mars element, because of their resistance and explosive attacks.

Stone Soldier
A Stone Soldier is a blue member with brown feet. Stone Soldier has 179 HP, 6 PP, 241 Attack, 105 Defense, 104 Agility, and 5 Luck. Its resistances are very lopsided, it has high resistance to the Mars element, but weak against everything else, especially Mercury.

Stone Soldier have a few attack options including a physical attack and the Monster Skills Headbutt, for enhanced damage, and Dynamite, where the Stone Soldier launches a high powered suicide attack against multiple targets. Psynergies include Blast and Mad Blast, both for Mars damage to multiple targets. While its PP meter severely limits its flexibility with these Psynergy moves (and outright prevents the use of Mad Blast), it will often attempt to cast them even if it doesn't have enough PP, effectively wasting its turn.

Felling a Stone Soldier yields 98 EXP and Gold, and in uncommon cases, an Elixir. In Golden Sun, Stone Soldiers are battled in the Suhalla Desert and on Crossbone Isle alongside Lizard King. In The Lost Age, they are located inside Tundaria Tower.

Boulder Beast
A Boulder Beast is a pink member with brown feet. The Boulder Beast has 211 HP, 14 PP, 327 Attack, 137 Defense, 140 Agility, and 6 Luck. While it's resistances are a bit better than Stone Soldier, they're still lopsided, with high Mars resistance, but low Mercury resistance.

Boulder Beast has the same abilities as Stone Soldier, minus Blast. Their PP meters compel them to use Mad Blast only once, but like it's predecessor, it will still attempt to cast it anyways and waste their turn.

Felling a Boulder Beast yields 278 EXP, 164 Gold, and in relatively uncommon cases, some Water of Life. They are located in the second half of Venus Lighthouse and therefore are exclusive to Golden Sun.

Raging Rock
A Raging Rock is a brown member with purple feet. Raging Rock has 186 HP, 48 PP, 294 Attack, 90 Defense, 121 Agility, and 18 Luck. Oddly, some of its statuses are lower than its predecessor, Boulder Beast. Again, its resistances have improved, but are still lopsided, with high Mars resistance, but low Mercury resistance.

Raging Rock's are the same as Boulder Beast's. While its higher PP meter increases its flexibility with its Psynergy moves, it still can't use them more than a few times, although they'll still attempt to do so.

Killing a Raging Rock gives you 465 EXP, 800 gold and in relatively uncommon cases, a Potion. It is only found on Magma Rock and is therefore exclusive to The Lost Age.