I use Dungeon Gear and Dungeon Mobs only.

The royal guard just puts up his shield when i go close to them and never charged a single attack.
I stood between royal guards for good 3 minutes without anyone even trying to attack me so they posses no threat at all.
Im not sure if this behavior is intended.

Intended currently, but planned to have a smarter attacking system while actively shielding

Fixed in dev, will be fixed in next release