This weakaura will place a bar on your screen the moment you cast 'Mana Shield'.* The top bar displays the time left of your 'Mana Shield' before it expires and the bottom bar represents the amount of damage left that your Mana Shield will absorb before breaking.
The names, text, color, sizes, and more can easily be adjusted by click and dragging while the weakaura window is active or can be edited within the weakauras options and code.
*NOTE: This weakaura is currently set to check your shield time duration and damage left EVERY frame. This can be changed in the settings once you import the weakaura. It is recommended that if your PC is strong/reliable to keep this setting as is for the best response time and accurate data being displayed by your Mana Shield bar.