It requires the power of speech.
You recite a psalm of tranquility. You speak a prayer of stability. You pray to Fish to keep yourself firmly rooted to the Disc.
You are tethered to the Disc by the power of Fish.
Success (already under the ritual's effect)
Your divine anchorage has been renewed.
You sense that Fish was uninterested in your request.
When under the effect of this ritual, trying to passage has this effect:
You say a prayer over a ribboned baton (consecrated to Fish and remembering). You attempt to visualise the place that you remembered. You pray to Fish to grant you the means to travel there. You meditate on the glory of Fish but your divine anchorage keeps you tethered in place.
When under the effects of the ritual, you get a line added to your description:
She is tethered to reality by the divine anchor of Fish.
You get various messages while the ritual is in effect, and a warning twenty seconds before it wears off:
Your divine tethers are unravelling.
When it wears off, you see this:
Your divine tethers shimmer and vanish.