The sapphire glacialis is a butterfly that players can capture with the Hunter skill at level 25 or above, granting 34 Hunter experience.
The hunting technique is the same as for other butterflies. Players must wield a butterfly net and have at least one butterfly jar in their inventory to catch any butterfly. One jar is needed for each butterfly you wish to keep. All of these items are available for purchase in Hunter shops.
A good place to catch them is on the second level of the Rellekka Hunter area, near the stairs. There are two spawns close to each other with small wander distances.
One can use a jarred sapphire glacialis on another player to increase their Defence by 15% + 4, rounded down. This will only work in multi-combat zones, and only if the player is on your Friends List.