While this may not answer all of your questions, I have some info for you regarding Dark Seal.
The new effect for Dark Seal that reduces casting time for dark magic isn’t meant for spells you cast on yourself such as Dread Spikes. It was designed to be used for offensive magic that’s used against enemies. The meaning of this effect is to reduce the possibilities of being interrupted while casting during fights where you are auto-attacking.
For a dark magic fast cast, we need to look into this a bit more, but we think it would be better as a job trait if we implement it.
Based on the above, I’d like to talk about whether we should change the effect of Dark Seal from a reduction in casting time to a reduction in recast time.
In the hypothetical event that we were to change the effect of Dark Seal to reduce recast time, the effects of adding a merit point would be roughly half of if the effect were reduced casting time.
For each merit point added, a 10% reduction in dark magic casting time.
For each merit point added, a 5% reduction in dark magic recast time.
Also, in the case that we revamp it to be dark magic fast cast (name pending), similar to Elemental Celerity, it would only reduce casting time and it would most likely not be able to have very high values.
The reason for this being that it will allow for constant casting of Drain and other spells and there is a concern about making it too beneficial while retaining the same dark knight firepower.
If there are enough people who wouldn’t mind the above example of changes, then the development team can look into revamping the effect of Dark Seal.