Roll 20 has this for the MotM thunderbolt attack for Kraken Priest: Thunderbolt. Ranged Spell Attack:
+5 to hit, reach 60 ft., one target.
Hit: (2d10) lightning damage plus ( 11d10 )thunder damage.
And the target is knocked prone. The book (MotMv) itself says the attack is 2d10 thunder damage NOT 11d10!!