I like it - thank you for sharing. A few notes:In trying to design a unique, alien beholder (using this thread as inspiration), I created a CR 8 beholder (gauth?) to challenge lower-level players and make beholder hive encounters more viable. In addition to remixing typical beholder abilities, I specifically chose eye rays that correspond to the 5e beholder zombie's "decayed" eye rays. I landed on CR 8, but I might be wrong with that estimate. Let me know what you think!
- I came up with a CR of 7, without including the anti-magic cone and "death throes." With those two added I think a CR 8 seems about right. Note I assumed the best possible damage, but with random eye rays that may be a bit generous. However,...
- ...it has rally low HP, and just average AC. A big reason for this is the 5 save proficiencies (which add 4 to the effective AC). I think it would be better to just have 2 saving throws and then you can bump up the HP. If you do that you could bump the HP to the 100-115 range.
- The beholder can use any eye ray with its legendary action. This one can only use an incineration ray. Is that the intent? I would think you would want more variety.