Glittering mud

A handful of glittering mud is a sediment-studded ball of silt from the ruins of Seleucar which can permanently turn the appearance of a resetting item into a Seleucar-themed variant. It is consumed upon use. Items which it can apply to include:

a ring
a bracelet
a pair of boots
a belt
a suit of armour
a pair of wings
a pendant
a shield
an earring

The promotional artefact can sometimes be attained via the Wheel of Fortune and in the Renown Shop. Similar appearance-changing artefacts include sparkling snow and gold candycanes.