So, usuallly Knowledge of the Ages should give you 25 * level experience points per item converted. I was killing literally hundreds of creepers using spawners (and yes I know creppers are not the best for this) but it took ages with looting 8 and KotA 4 to get from lvl 54 to 55. From what i've seen it should take like 1-2 Creeper for a level up since I only need 300xp for this level up. So I feel like something is messed up with the calculation. Also I haven't seen this issue posted before

Apotheosis-1.18.2-5.3.5

Forge 40.1.20

KotA's code and formula has barely (if at all) been changed since 1.16, that code is visible here https://github.com/Shadows-of-Fire/Apotheosis/blob/1.18/src/main/java/shadows/apotheosis/ench/enchantments/masterwork/KnowledgeEnchant.java#L42

The amount of raw experience needed at that level is extremely high, because of the exponential scaling. I cannot currently check what the number is, but its certainly more than 300.

the code looks good to me, for someone who has never programmed in java and has barely any competence using C#. To the Amount of XP, the calculation for the xp need to level up is 9[level]-158 (this is for lvl 32 and beyond). With level 54 i need 328 xp to level up. I will check if there is something else messing with the xp drops because this is really not normal. Thank you for the answer though

Alright, I found out that Apotheosis is not the problem. The actual problem was the Mod Clumps that didn`t put the experience orbs together correctly, so yea, my problem is solved