Arachnis

Arachnis is a rare spider that spawns in Lunarfall and Frostwall during Hallow's End for players who have purchased and used Creepy Crawlers. Among other non-notable items, Arachnis drops the Sack of Spectral Spiders toy. Arachnis can only be looted once daily, but it spawns every five minutes or so.

The Creepy Crawlers usage applies to the garrison, so realm hopping or using Group Finder to enter another player's garrison for this spider will work.