Guild Wars 2

The 6th bonus skill grants us fury on activation of heal. So why when I use a heal skill under water I only get 3 stacks of might? (via 2nd bonus skill). There shouldn’t be any exceptions to this rune. It’s quite irritating.

When you go underwater your land helm is removed and your aquatic helm is equipped.

If you don’t have a Rune of Altruism installed on your aquatic helm then you’ll drop down to 5 of 6 Runes of Altruism and you won’t get the #6 bonus.

TL;DR – You need a seventh Rune of Altruism installed in your underwater face mask.