Undead Summoner: Skills upgrade once per second

[Cool story + no heroine + invincible + dungeon flow]
Change to become a summoner of the dead, and the skills can be upgraded once per second, and there is no upper limit for permanent upgrades.
[Small Skeleton Summoning] – [Big Skeleton Summoning] – [Elite Skeleton Summoning] – [Epic Skeleton Summoning]
[Desperate Skeleton Summoning]
[Scary Skeleton Summoning]
…
After N upgrades
[Skeleton Summoning to Welcome the Return of the Great Skeleton King]
In addition, there are [Hellfire Summoning] [Hellhound Summoning] [Bone Dragon Summoning] [Ghost Summoning]…
Skills are upgraded once per second, how do you deal with it?