Is it the Exit materia, and the use of Escape and Remove?
Pay your dues--I'll set you free (Use MP to cast Escape, setting you free from battle)
From boundaries of monotony; (See above)
And danger I will help you to surmount. (Remove, the other spell, eliminate the enemies)
Raise or lower the standard fee, (Standard fee being the MP cost. Escape requires 16 MP, Remove needs 99)
Rewards will change accordingly; (You get EXP from Remove but nothing from Escape? Not sure about this line)
But careful not to bankrupt your account! (Account being the MP gauge. Remove is quite costly)
