1. A fixed guild upgrade stage at which control is granted.
That is, neither earlier nor later, but due to the critical importance of these spells in the game — strictly at a specific moment. For example.
Town Portal. Required:
in SoD - construction + 3 upgrades
in HotA - as the seventh spell on level 4.
That is, in both cases, it requires investing exactly 4 times into level 4 (exception in HotA - Tower - 3 times plus library).
Fly.
Requires investing 2 times.
in SoD - construction + 1 (one) upgrade
in HotA - as the second spell on level 5.
Dimension Door.
Requires investing 4 times.
in SoD - construction + 3 upgrades
in HotA - as the fourth spell on level 5.
I immediately suggest noting that two things are described here. First — the idea itself.
And second — the decision on the number of upgrades, which I wrote based on what I currently consider correct.
And these two things are not the same. If anyone responds — please respond to both parts separately.
2. To cast any spell under any circumstances, a hero must have purchased the book and leveled up the corresponding wisdom level.
This is necessary to slow down the pace from books, scrolls, and heroes from prisons on Jebus Cross, for example.
In HotA, Town Portal should not be in level 4 shrines at all.