Astlayrix is located in the Herblore Habitat area. He explains to you how to find jadinkos and lists the requirements to attract them after having found them at least once. He's from Taverley. He invited his friend Dotmatrix over, who was attacked by a mutated jadinko.
Astlayrix's name is a pun on the '80s pop star Rick Astley and the common convention of ending druidic names with '-ix' (itself after ancient Gaulish Celtic naming conventions). His examine text is an allusion to "Never Gonna Give You Up", Astley's hit song that has become the centre of an internet meme.