Wasn't the nerf a bit too harsh? They reduced the Necromancer's power by only 2 times, and now they rarely use Necromancers, preferring Transformers instead. But here, they nerfed it by 5 times...
The Necromancer nerf is quite decent; it's the weakest Tier 7 unit, instead of Angels, which is a significant weakening.
The Necromancy percentages themselves haven't changed; they are still the same: 10, 20, and 30%.
The bonus percentage for Necromancy specialization has been changed.
That is, previously, the total Necromancy percentage for Isra/Vidomina was calculated as follows:
k * (1+0.05*N)
Where:
N - the hero's level.
k - the Necromancy percentage: 20% at the advanced level, 30% at the expert level.
Now the formula is:
k * (1+0.01*N)
That is, previously, Isra/Vidomina at level 10 had a 30% Necromancy rate, and now she has a 33% rate.