Wurms are first encountered as Sand Wurms in the Crystal Desert (where players are sometimes warned about their presence by bleached bones or by seeing them devour other creatures at a distance). They are then found in the Southern Shiverpeaks and the Ring of Fire Islands. Wurms can also be found in the corrupted Tombs of the Primeval Kings. Most Wurms have high armor ratings and continuous health regeneration, and some Wurms are known to have unusually high health totals compared to other creatures of the same level. There are also Junundu wurms exclusive only to Guild Wars: Nightfall, which swallow their user and allow them to traverse across areas deemed unsafe for travel like The Desolation.