Right. Muscle Monks are such a strong growth type. While the Heavy Warriors and Heavy Knights were conventional Tanks, the Muscle Monks were specialized in tanking and were the ones playing the most active part as forefront players.

From what I've read so far, Muscle Monks/Priests are literal walls. And have very few ways to attack back. While the other classes are like normal tanks we have in our MMORPGs that have a few attacking skills, their system is different. If you want to attack, you need to have the skills of whatever weapon you're using. As MM/MP only use shields, they don't have any options besides the typical shield bash attack. You don't need a wand to cast [Heal], so they can use a larger shield to tank better.