[RPG] n item or spell to see through the Disguise Self spell

A face can't be changed with silent image, but other options exist

Because the spell silent image is in the figment subschool of school of illusion, the spell "cannot make something seem to be something else." An illusion spell of glamer subschool like the spell disguise self, for example, can make a drow's face appear to be a different face, as spells of that subschool can make things "look, feel, taste, smell, or sound like something else."

However, the Disguise skill is usable untrained, and the drow's friends—if he has any—can aid him on the check… or, if a friend is more capable than the drow, the friend can make the Disguise skill check on the drow's behalf, disguising the drow. With enough friends—and the GM's permission—the drow should be able to roam the town unhindered until some high-level watchman with a super-high Perception modifier penetrates the disguise anyway. A disguise created by the Disguise skill has the added advantage of not being magical, so the spell detect magic won't reveal it, the spell dispel magic won't collapse it, and the spell true seeing won't penetrate it.

Also, as a level 5 PC—if this avenue is really important—, the drow could invest 1,800 gp of his 10,500 gp PC wealth in a hat of disguise. Just make sure the command word is utterly mundane so the drow doesn't look like a weirdo when he must reactivate the hat every 10 min.

Finally, confirm with the GM that in the GM's campaign that drow are still feared and hated. In many settings, drow are just different elves, and folks won't, like, kill them on sight or anything.

They can cast each spell once per day, so two spells in total. The trick is in the wording:

Once you cast either spell, you can't cast it again with this trait until you finish a short or long rest.

Since "either" means "The one or the other" and "it" means "the one previously mentioned" the ability essentially reads:

Once you cast one of these spells, you can't cast that spell again with this trait until you finish a short or long rest.

(But honestly, the wording on this trait is rather confusing to me as well. Might be one these cases where my 'not a native English speaker' shines through.)