This essay discusses the need for an extra attunement slot so that I may purchase and equip the Stormrider Boots (modified) by Greg Gilliland. While I cannot produce the picture or URL the essay requires, it is in the Facebook Messenger chat between him and me.
As a bard, removing oneself from sticky situations can be difficult as we usually do what we can to get ourselves into them. As a controller, I want to move quickly across the battlefield and these boots allow me to double my speed. When I get too close to hostile creatures, they create a lightning strike doing 3d8 damage to the enemy. After causing this damage, the boots will allow me to move away from enemies quickly and they will have a disadvantage against opportunity attacks when I move away from them. These boots also provide a lighting orb, chromatic orb spell, for free once per day.
As you can see, these boots would be incredibly beneficial to me and my party allowing me to move faster and freely to assist my party members during encounters.