Alchemy is way to easy to level now

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With a proper (vanilla) setup you can farm level 1 to 1000 in 20-30 minutes, which is almost impossible with any other skill.
With the old values (from 10 years ago) farming level 1000 with a proper setup would have taken almost 19 times as long (6+ hours) which might be too grindy, as stated in the changelog. So my suggestion would be to restore the values from 2.2.007 or even chose slightly smaller values (e. g. 300 for stage 4, which would still be 2.5 times as fast as previously (3h+ with the proper setup)).

Compared to other skills like archery, alchemy wasn’t that grindy. Although, archery is usually leveled on the side through normal gameplay, while alchemy is mostly actively leveled to increase the level. So a somewhat increased value (compared to 120 xp for stage 4) might be sensible.