I’m not sure that it was ever in effect here. Hell levels also won’t seem so bad here with more content but yes, some levels just take more exp.
https://wiki.takp.info/index.php/Experience_Points#Class_Experience_Modifiers Hybrid is not in effect, however the races that a lot of people use for their hybrid classes have it (Ogre, Troll,and Iksar SK's or Barbarian and Troll Shamans are popular for example)
Hell levels exist here yep. They have been a little smoothed out, but still exist. A lot of people dispute it, but I've leveled enough characters to know they exist. I believe a "Hell Level" is defined as a level that takes noticably longer to get through than the previous and subsequent level They are as follows: Level 30, 35, 40, 45 - these take noticably longer to get through than the previous levels albeit not drastically, but it's slower than the subsequent level for sure 54 and 59 is double hell - big noticable jump in exp required compared to previous level, albeit level 54 one isn't more compared to subsequent level looks like, however 59 sure is. the multiplier jumps twice as much at 54 and even more at 59. don't believe me? I argued about it, and Torven shared a table in June 2022 on takp discord.