Each of the 4 options represent each difficulty, that is, easy|normal|hard|impossible respectively. As for the variables, exp is the experience you recieve, alead is leadership requirement, spexp is spirit experience, money is money, rage is how much rage you recieve in battle, manarage is probably how fast mana and rage increase and decrease respectively, bossatk and bosshp are boss stats, deadmoney is how much gold you recieve when you get wiped out. These are all just simple factors that multiply their respective values depending on the difficulty you play on. These are all just educated guesses since you pasted gibberish for where description should be and I'm too lazy to check for myself.
