D&D 5E - Beholder mechanics
Overlooking the very concept that a floating eye-monster with spell powers even exists, the beholder was probably born from the idea of what constitutes a monster that can threaten an entire group of adventurers with magic powers of their own. In other words, the beholder is designed to be the antithesis of an adventuring party. So however you envision "eye rays", it can't be a universal definition that can be defeated by a single mechanic. That would defeat its intended purpose.Think of "eye rays" are a generic expression. Some may be physical beams that can be evaded. Others might send telepathic or psychic waves that invisible to sight. That is why Will... er, mental saves are appropriate.
I agree with you about petrification, to an extent. The save to avoid the beam itself makes sense, but then a second one should be used to resist the effects (i.e. DEX, then if hit, CON to resist petrification. If succeed, then slowed or dazed or something for 1 round? I don't know. 4e had this down pretty good.).
Great book, btw. I have it on Audible. It really helps making tactical combat decisions interesting and portraying monsters differently in 5e. It should be a required supplement for the Monster Manual and the DMG.
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