You gain a +10 bonus to Dexterity (Stealth) checks, and you can't be detected or targeted by divination magic, including scrying sensors.
Boon of Undetectability
RewardDMGp. 2322014
Raw data
{
"name": "Boon of Undetectability",
"page": 232,
"type": "Boon",
"__prop": "reward",
"source": "DMG",
"entries": [
"You gain a +10 bonus to Dexterity ({@skill Stealth}) checks, and you can't be detected or targeted by {@filter divination|spells|school=D} magic, including scrying sensors."
]
}