Transmutation anti-frustration
Idea: re-use the "katazuli" mechanic. A cast of transmute opens that menu where player chooses what to transmute, then the server starts draining player's mana and converting that item in their inventory (when there is enough mp left in caster). Thus player needs to only sit there and wait. When player moves, spell dissipates and ends.
Bonus: the start-up and run-time costs could be different depending on map: e.g. cheaper in Halinarzo and expensive in Hurnscald.