Q: Do Stomps or Thunderstomps benefit from any other special rules,
equipment or magic items? Or vice versa? (p76)
A: No to both questions.
Q: Does a magic item or spell that gives a bonus to a characteristic,
do so bonus for all rules purposes (e.g. the effect of spells,
characteristic tests, etc)? (p4)
A: Yes, except for magic weapons or where the description of
the item or spell specifically says otherwise.
Получается, что спелы дают бонус стомпам.
Вещи, маг.вещи и другие спец.правила не дают.