Sorry if this sounds like a novice question, but where specifically does it say that Stegadons have Thunderstomp? A friend of mine is arguing that Stegs don't have it, and I can't find where it says they do so I can back myself up. Thanks for the help.
stegadon is a monster (see page 485 of main rulebook). all monsters have thunderstomp (page 85 of the rulebook).