Since your hero's stats are determined by the name you input at the start of the game, it would technically be feasible to defeat the Green Dragon at level 8. Accounting for the varying stats between one hero to the next, that very same level could be all but impossible for someone else. Needless to say, it's not an easy task. At that low of a level, coming out of the battle in one piece would amount to a battle of attrition...I would imagine alternating turns of attacking/using Hurt and Herbs. Sleep can sometimes work, but at that low of a level, it's quite a gamble...if it misses, you end up right behind the 8-ball from the very start.
By the way...it really sucks that the names I've used in the past always end up with crappy level up stats
