Glacius is a highly trained warrior with a variety of unexpected and very useful abilities. His natural armor makes him extremely durable; he is adept at hand-to-hand combat and can also use his shapeshifting abilities and control over ice in many different ways, allowing him to fight at great range, summon defensive barriers, alter the terrain, and so forth.

He's not big on being dragged into other people's conflicts (especially when those conflicts involve the gods), but if he suspects innocents will be injured then he'll show up to fight the nautilus back. Any of his friends being threatened is a sure way to draw his ire.