mentioned above, which appears in 5e in Mordenkainen's Tome of Foes (since it is associated with water, though the book mentions no relation to Dagon specifically, but that Forgotten Realms Wiki link does), but it's CR is quite high for the party level range I'm planning. There...
SSeeeebbeecckk eeffffeecctt aaccrroossss ddooppeedd llaayyeerrss.. In the AlGaAs sample, most of the ratio is taken up by the exponent term. For x = 0.33 at 310 K, the exInpotnheenAt ilsG−a6A6,sssoaamspmlea,llmpeorsctenoftatgheecrhaatniogeisintathkeenexupponbeyntthheaseaxplao...