Orokin-inspired Dex Rhino (Orokin-inspired palette can be used on near anything. Feel free to experiment!)
Armor used:
Dex Raksa Set
Syandana used:
Dex Nouchali
Sentinel:
Helios (fashioned to look like beta concept art)
Weapons used:
Dex Sybaris
Dex Furis
Dex Dakra
Palettes used:
Warframe/weapons/armor/syandana:
Orokin-inspired
Off-white is from Beach (column 2, row 10 (up to column 2, row 11))
Golden yellow from Halloween (column 4, row 7) (alternatively Classic Saturated column 5, row 14)/Hallow's Eve (column 5, row 7 (looks best on metallic bits))
Riven Purple from Tenno (column 5, rows 13 and 16) (especially good on metallic bits)
Void Energy from Ki'teer (column 1, row 1 and column 5, row 3 (as accents for emissive/flowy parts)
Sentinel:
Primary from Tenno (column 5, row 7)
Secondary from Shamrock (column 5, row 4)
Tertiary from Tenno (column 3, row 11)