You know Druidic, the secret language of druids. You can speak the language and use it to leave hidden messages. You and others who know this language automatically spot such a message. Others spot the message's presence with a successful DC 15 Wisdom (Perception) check but can't decipher it without magic.
Druidic
Raw data
{
"srd": true,
"name": "Druidic",
"page": 64,
"level": 1,
"__prop": "classFeature",
"source": "PHB",
"entries": [
"You know {@language Druidic}, the secret language of druids. You can speak the language and use it to leave hidden messages. You and others who know this language automatically spot such a message. Others spot the message's presence with a successful {@dc 15} Wisdom ({@skill Perception}) check but can't decipher it without magic."
],
"className": "Druid",
"classSource": "PHB"
}