When you zone with a lich spell as a necro, your HP regen changes and you are worse off if you don't recast it after zoning. This is not just a visual UI bug, you will lose more HP every tick. With higher lich lines you lose extra HPs. Call of Bones is -2 HP Regen before zoning; -5 HP Regen after zoning. Before Zoning: After Zoning: