Homebrew Deamonous Draconis Species Details

A massive dragon that appears to be demonic in nature due to its glowing red eyes and 13 foot long horns and massive 5 foot tall fins going from the base of the head to the base of the tail. The Deamonous Draconis is a half aquatic dragon that can swim at the same speed that it can run. They stand at about 18-19 stories tall. They have a wide range of abilities and immunities making them a great multiclasser. These dragons hail from the decay kingdom.

They are Immune to both fire damage and frost damage.
These dragons can hold their breathe for up 1 hour. 
entrance- this ability is similar to hold person but causing 5d10 +4 points of psychic damage.
Hellish Flames- This flame attack does high damage but only lasts for 1 minute and does 20d10 +10 of Fire damage.

(only Raythar is immune to Elexxisis's infection.)

Deamonous Draconis Traits

immunity to fire and frost, Dive for up to 1 hour, Entrance, and Hellish Flames.

Size

standing at about 18-19 stories tall.

Immunity to fire

they are immune to fire damage.

Immunity to cold

They are immune to all types of cold damage.

Dive

These dragons can hold their breathe for up 1 hour. 

entrance

entrance- this ability is similar to hold person but causing 5d10 +4 points of psychic damage.

Hellish Flames

Hellish Flames- This flame attack does high damage but only lasts for 1 minute and does 20d10 +10 of Fire damage.