The Greatshield of Glory is an overall improvement to the Tower Shield, providing marginally stronger defenses in exchange for more weight, less stability, and a higher strength requirement. On the other hand, this greatshield has a very high resistance to fire, though the Gyrm Greatshield will still outclass it in terms of stability coupled with its innate immunity (100% reduction) to fire damage.
Unlike the Gyrm Greatshield, however, this shield possesses much more resilient elemental defenses and resistances, allowing it to be used in many more areas outside of fire-themed locations.
Interestingly, the shield deals both physical and fire damage when used to bash enemies, yet the fire damage does not scale at all. It does, however, improve as it is upgraded.
The Greatshield of Glory upgrades with titanite, up to +10.
- Based on its description, it is more than likely that this greatshield and the Tower Greatshield were mislabeled as well as their descriptions were switched. This greatshield is clearly based on the Tower Shield from Dark Souls, as its pattern is too similar to ignore. Added the fact that the Royal Guard in Drangleic Castle are using the Syan's Set, based on the armor Knight Syan donned to battle, makes even more sense that the Greatshield they are using is not the Tower Shield but the "true" Greatshield of Glory.
- It also seems like this shield is also very heavily based on the original Tower Shield from Demon Souls. The one wielded by the Tower Knight.