Ok 1st of all, for these who doesn't know DS deals dmg and heals DK for 5% of his max hp for each disease on the target.
Blood tree offers two interesting talents.
1st one being Crypt fever, will it count as 3rd disease hence giving DS 50% extra healing?
Also 2nd one is improved DS increasing healing dealt by DS by 75%.
If both of these stay for live it's gonna look something like this:
5% x 3 + 75% = 26.25% of Max hp healed.
Rune generation is being nerfed, yes, but still this will be OP imho :P