Hades is a rare shadow tarantula owned by Timothy Rune. A shadow tarantula has the ability sniff out the dying from over a mile away. He respects his master and obeys, most of Timothy's commands.
Timothy found Hades one day on a trip through Mexico. Hades had been cornered by a large beast and was about to be killed. Timothy spotted and saved him, and afterwords Hades just followed Timothy around. After Hades helped Timothy quite a few times (or more), Timothy finally made a little oath with Hades. As long as Timothy kept Hades safe from harm, Hades would sniff around to see if Timothy had missed anyone.
Like all other shadow tarantulas, Hades can smell the dying from over a mile away, as well as become virtually invisible in the darkness.