Personally, I think Soul Altar should be released with Guthixian content, or content that specifically features Anima Mundi. The reason for my opinion is based on the soul runes' appearance and the motifs attributed to Guthix.
The symbol in the runes is a stylizised butterfly: it shows more clearly in RSC's version of soul runes than in modern-day RuneScape, but it is a butterfly. Butterflies are associated with souls in multiple cultures: Mesoamericans considered butterflies to be the reincarnations of the souls of dead warriors, a butterfly was seen in Japan as the personification of a person's soul, the Enlightenment-era French works list butterflies as a symbol for the soul, Romans believed that the soul left the body through the mouth in the form of a butterfly, and the ancient Greek word for butterfly is "psyche", which means soul. Therefore, it makes a lot of sense for the soul runes to feature a butterfly as their symbol.
The only significant entity in RuneScape to have a butterfly motif is Guthix: Guthix was described years ago to have arrived on Gielinor in the shape of a butterfly, the key to his resting place is in the shape of a buttefly, Guthixian butterflies manifested after his death, butterfly catcher was a profession in Naragun, his homeworld, and based on Guthix's dialogue in his memories, her daughter, Aagi, loved catching butterflies: even Kami, Guthix's memory of Aagi, wears a butterfly belt buckle and wisps merging out and into her body briefly take the form of a buttefly. Therefore, we have pretty solid example of Guthix being tied with butterflies.
So, butterflies are associated with souls in many cultures, and Guthix had butterfly motif and was in touch with Anima Mundi, the soul of the world, better than any of the other gods. Therefore, it makes sense to tie the Soul Altar into Guthixian content.
26-Mar-2016 22:20:11