Well, I believe the Dwarven Title display effect "Stout-Hearted (http://www.guildwiki.org/Stout-Hearted)" should effect Stone Summit as well.
In Prophecies, before we knew anything about the Destroyers, the primary enemy of the Deldrimor Dwarves was the Stone Summit. Now they are, arguably, the Destroyers, but the Stone Summit still impact the Dwarves in many ways. They are found in Slavers' Exile, Vloxen Evacuations, and Fronis Irontoe's Lair. They also play a role in late game prophecies, and are one of the major enemy factions in the game.
It would also be nice to make this useful compared to the other title display bonuses. Norn have high health, Asura have high energy, and the Vanguard has better defense, more adrenaline (awesome for warriors) and high energy for Charr. The Dwarven title has stealing a small amount of health for every skill used against a destroyer. After a Time for Heroes quest, the only place you really fight destroyers is in Glint's Challenge, which was made easy with the recent hero update.
It would hardly improve anything but a small amount of DPS, but what I'd like to see is the Great Dwarf fight against those that betrayed him as well as those trying to destroy him.
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