Your Heroes and Companions can't be attacked unless the attacking player pays 2M for each attacking Hero or Companion.
Frequently Asked Questions
Player's cannot declare any attacks on Gwendolyn or your Companions without paying 2 mana (M).
The ability does not trigger in response to something like Retaliate as Retaliate is not considered an attack.
Further questions? Email me at Hero@TalesoftheTomes.com