MG made big impress for me. I liked idea about ultimate spell and researching. Some ideas come for FG. Fighter guild is about fighting, so that about some Martial - Arts styles. So you can advance you character by learning some martial arts styles. To learn martial style you have to do quests (like training, learn history and so on). Each martial art style have own battle stance so you can recognise player by how his standing, what armour have and what type of weapon it uses. Some examples:

Ninja - light armour (so it can special light armour with some weapons like star and sword). Ninja can engage target from distance (this most deadly attacks). Also ninja can climb on tree, obstacles and walk through walls.

Samurai. Medium armour. Samurai have big advantages in close combat by wielding sword.

Crusader. Heavy armour. Crusader big advantages in surviving. It have a lot stamina.

Gladiator: Medium and Heavy armour. Big advantages battle with more enemies

So each martial arts have own unique skills and armour benefits. Like if you will be ninja with heavy and medium armour so can't climb and attack from distance.

here was just example. What you think and what you would like to see in future in FG.