Avatar form for a cleric of Apsu

[wujenta]

We just finished part 1 of the book 6 of age of ashes, and my cloistered cleric of Apsu reached lvl 19 and got his 10th lvl spell, but i cannot find what special attacks and specifics wuold i gain if Ii choose to cast the Avatar spell… any1 has any idea if there are rules for that or i will have to houserule about it

[Leomund "Leo" Velinznrarikovich]

There are no rules. It will have to be houseruled.

My quick thought would be:

Apsu Speed 30ft, fly Speed 70ft;
<> Melee bite 6d8+6 piercing
<>> Breath 30ft cone 6d6 cold

[The Raven Black]

Since Apsu is described as a gigantic Silver dragon, I would start with a Silver's attacks and put them on par with the stats that other deities' Avatar forms have.