Speaking of the skills list.  Here's a couple ideas for you to consider, [@Zelosse].

Eye of a Thousand Nights: Allows a character to build homestead style cabins in any field area, thereby creating safe-zones.  This does require materials.  The criteria for unlocking this rare skill is that the player must spend 100 consecutive nights in a dungeon.

Titan's Hand: Allows a 2-hander to be wielded 1-handed.  This allows shield use, not dual wielding.  Requires maxed out strength attribute (circa 1000)

Twin Wield: allows two identical, unnamed, weapons to be dual wielded.  Quest Reward.