It seems to me that the benefit that powerful vampirism brings is too high. I mean, it heals a lot more and if you calculate the price it is much cheaper than the other two.
|Price (token + tax)||% Heal||Cost Efficiency|
|Basic||2 * 30k + 15k = 75k||5%||0.066|
|Intricate||4 * 30k + 55k = 175k||10%||0.057|
|Powerful||6 * 30k + 150k = 330k||25%||0.076|
If you look at Void Imbuement, it makes sense, because the powerful imbuement has less efficiency, as it should be.
The cost efficiencies for Basic, Intricate and Powerful Void imbuement are 0.04, 0.028 and 0.024.
It doesn't make sense for the powerful vampirism be better and cheaper. Is this correct? Is there any reason for that?