Unlike with beast shape II, however, you keep your own head when using this spell and can cast spells with verbal and somatic components, even though the naga form doesn’t have hands.
0/ Is it similar to beast shape spell, effect ? Can a fleash eater have an ability from naga ?
If the form you assume has any of the following abilities, you gain the listed ability: climb 60 feet, fly 60 feet (good maneuverability), swim 60 feet, darkvision 60 feet, low-light vision, and scent.
List of the Nagas :
Naga, Dark
Naga, Dream
Naga, Dream
Naga, Guardian
Naga, Lunar
Naga, Royal
Naga, Slime
Naga, Spirit
Naga, Water
If the form you assume has any of the following abilities, you gain the listed ability: climb 60 feet, fly 60 feet (good maneuverability), swim 60 feet, darkvision 60 feet, low-light vision, and scent.
1/ There are a problem because there aren't none naga with climb and scent abilities with the list above.
This spell functions as naga shape I. Additionally, if the form you assume has any of the following abilities, you gain the listed ability: burrow 30 feet, climb 90 feet, fly 90 feet (good maneuverability), swim 90 feet, blindsense 30 feet, darkvision 60 feet, low-light vision, compression, constrict, detect thoughts, dreamsight, grab, hypnosis, poison, sneak attack +2d6, and spit.
2/ There aren't none naga with burrow, blindsense, compression, constrict, grab abilities.
3/ Same thing with tremorsense, bleed (as the royal nage isn't authorized).
Thanks for your future help.