Theres no other option to instantly cure paralysis (which is a niche but usefull ability) under any circumstances like for example units that self paralyse or units paralysed by a vampire etc.
There simply isnt. Such niche options are delivered via event so that everyone gets a chance to obtain them (as events are there to fill niches). Saying there is no Liana is forbiding every single player on the english aigis a whole niche strategie. (As well as the only event healer far outside there close to us).