So this set obviously caused issues a while back. People were exploiting it to get multiple stones at the same time. Clearly we need to make sure its not exploited in the future, but I think the functionality of TBS and mundus stones needs addressed. Essentially, the issue is that every time you equip/unequip TBS, you need to run and grab a new mundus. I might sound silly, but the number of times I have done this on accident and had to port out of an instance (trial or dungeon) to grab a new stone is more than I care to admit. Yeah, yeah, its my own fault, but I think its part of a bigger issue. It is impossible to swap gear around if TBS is in play. This could go for a tank that wants to switch to DPS on certain fights that cant be taunted for example. Check your mundus has become part of our ready check in trials. Many Stamina DPS, especially, like to carry and run different gear sets depending on what others are running (nightmothers, alkosh, sunderflame, hundings, TBS). This usually means that someone is always porting out right before we start to grab another stone.

What I propose is that you allow each character to have a Primary and Secondary Mundus. Your Primary will always be active. The tooltip on TBS could read, "enables your secondary mundus" or something to that effect. This could be taken one step further to where you could perhaps switch (without going to the shrine) the priority of the stones. That way a healer could swap between thief and atro, or a person like likes both PVE and PVP could swap between thief and serpent for example.

Another idea, as I know ZOS likes money grabs. I would probably pay 5k crowns for a mundus assistant. Basically, I summon an assistant and they act like a shrine of my choosing. My group about murdered me last night when I accidentally hit the wrong command to swap bars and ended up unequipping my TBS. I had to port out in the middle of the second gauntlet in VMOL and race back. Fortunately my group rocks and I made it, but it would be a nice if there was a better option.