Instant Igloo

An instant igloo looks like an unremarkable snowball, except that it does not melt in high temperatures. If hurled to the ground at any point within 20 feet, it transforms into a large igloo. The igloo is identical to that created by the spell tiny igloo, except that the igloo created has a 10-foot radius and can contain up to 2 Large, 8 Medium, 32 Small, or 128 Tiny or smaller creatures. The igloo lasts for 16 hours before transforming back into its snowball form, at which point it cannot be used again for another 8 hours.

Prerequisites: Craft Wondrous Item, Widen Spell, tiny igloo.

Cost to Create: 5,500 gp, 440 XP, 11 days.

Source: Frostburn, page 111.