Rolls
Stealth - (1d20+4)
(12) + 4 = 16
Stealth (advantage from Nomadic Chameleon) - (1d20+4, 1d20+4)
1d20+4 : (12) + 4 = 16
1d20+4 : (20) + 4 = 24
Stealth - (1d20+4)
(16) + 4 = 20
Perception in favored terrain - (1d20+2)
(1) + 2 = 3
Dex save - (1d20+2)
(15) + 2 = 17
Perception - (1d20+0)
(17) = 17
Sneaking - (1d20+4)
(5) + 4 = 9
Perception - (1d20+3)
(17) + 3 = 20
Perception (favored terrain - (1d20+2)
(13) + 2 = 15