i think there should be a new shield slot. you would get a wooden basic shield as a reward from a quest. when you got to a cerain level you would get the next set of shields. they would give more health, mana, and also give you certain resists. KI, please consider this.
i consider this a very good idea i really like shields because the more shields and resist i have the weaker the attack. i think to get shields from a quest you could defeat a boss that uses a lot of shields for example:
for lvl 5: shield begginer for lvl 10:shield apprentice for 20: shield wizard for 30: shield magus for 40: shield saint for 50: shield master for 60: shield controller for 70: shield headmaster