Constant Effect versus Concentration

[amul]

@Kid Gloves

Bottomless Pool becomes CrIm 20 at touch range, so you only need a level 20 Intangible Tunnel effect. Of course, the intangible tunnel effect has other benefits too - you can put further enchantments in your item that make use of the tunnel.

This is brilliant. Especially for a mirror that I am cough cough absolutely not going to put additional scrying enchantments on.