The Link: http://wiki.spiralknights.com/Energy_Revive_Blast

This is just a basic request for any further information on the CE Revives. Most imporntantly, I've noticed that it says 'increased invulnerability duration', but what does this mean in-game? Also, the Energy Hearth to the right-side of the revive box, does it actually change in any visible way as the CE revives get higher?