Zimkitha’s elemental link heals 4%.
By taking this healing bonus upgrade Zimkitha’s heal is still… 4%
The wording is somehow a bit misleading, I wouldn’t have chosen this route if I knew the bonus applied to after the initial special skill healing was given. Ie. +2% of 4% which is basically no effect.
Of course it makes a difference when there’s another healer healing but still an overall stupid choice…