I think I already explained it above – to enhance "Necromancy" (and even explained why enhancing "Necromancy" is needed).

Stop repeating the obvious. We don't need to enhance Necromancy without increasing Spell Power. Why pay more if the result is the same?

That's the point, the pillar is a dual-purpose object – it serves as both an increase in Spell Power and a 10% enhancement to "Necromancy" (and I also explained above why this enhancement is needed – especially since we will only get the Spell Power increase next week, but the enhancement will be available on the day of construction, meaning we can conduct a number of necessary battles with already enhanced "Necromancy").

Really? I was only talking about the main criterion.
And: With already enhanced Necromancy, but without Spell Power, who will we raise?

So, does the difficulty of obtaining a skill automatically lead to the conclusion that its usefulness is close to zero?

I explained it. If it's not clear: the main criterion for the uselessness of a skill is:
- Comparing it to other skills that we could take + "unnecessary enhancement"
And besides, everything depends on many factors, but the greater difficulty of upgrading is only in 3rd place... the conclusions are obvious...
Secondary factors are of little importance when there is a greater variety of primary ones. Therefore, under certain conditions, as described above, the difficulty of obtaining it is not expressed in that sense. Some blame Lordesat, but they themselves hold a flawed point of view and are looking for excuses....
I'll repeat once more: you can't compare something that gives a benefit with nothing. You always need to compare it with the available options.
I'm ending this one-on-one discussion because it's pointless to continue in this situation, and it's also off-topic :(
Let everyone decide what is more important to them...