Sentinel

Sentinel is an optional superboss in Golden Sun: The Lost Age, located in the Islet Cave. It is known as the "guardian of wind".

Battle stats
Sentinel has 8736 HP which regenerates 200 per turn, 780 PP which regenerates 30 per turn 608 Attack, 216 Defense, 171 Agility, 54 Luck and can attack 3 times per turn. Though it's element resistance is fairly balanced, it is weak against Venus attacks and most resistant to Mercury. When slayed, Sentinel yields 10538 EXP, 6144 Coins, and access to the Catastrophe Summon Tablet.

Sentinel has a number of powerful psynergies including: Searing Beam, Blue Bolt, Destruct Ray, Spark Plasma, Guard and Break. It also knows the monster skill Armor Crush.

Battle strategy
Most players rely heavily on summons to defeat Sentinel.