Needs to be said before getting into the build itself but a lot of Johanna builds see users buffing her abilities and leaving the iron skin as it is. While there is NOTHING wrong with the tried and tested approach, I have found that a higher level of production can be gained from Johanna using this approach instead. When effectively used Johanna goes from being a tank that can take damage for days...to one that can not only do that but also be the tip of the spear as a playmaker as well. One that quite literally cant be stopped by much.

Notes:

1) Farm globes. Health increase after 30 globes is a VERY nice add on to an already high health pool.
4) Passively buff your regen while adding a first aid like active at an early stage of the build.
7) Essentially using offense to reduce the cooldown of your trait instead of your abilities.
10) Both heroics are good here but I personally still see the Blessed Shield as the go to in most cases.
13) Buff your trait by 20% while adding a second way to reduce the cooldown on it overall.
16) Makes Jo faster than a mount while being unstoppable. Game changing in the right hands.
20) Makes it so that you have to kill Johanna twice in order to beat her.