For the sake of completeness:
Or at least berath sigil does corrode DMG and weakened, wich is strong.
Symbols do 15-25 base damage in 2.5m base radius, every 3s, for 2s base duration.
Symbol of Berath: deals corrode damage vs fortitude. And weakens.
Symbol of Magran: deals burn damage vs will. And blinds.
Symbol of Scaen : deals pierce damage vs deflection. And hobbles.
Symbol of Eothas: deals burn damage vs reflex. And grants +20 to defenses.
Symbol of Wael : deals freeze damage vs fortitude. And grants +30 defense against charm, domination, confuse.
So yeah, Berath variant is indeed good. Even if it targets fortitude, subsequent ticks might benefit from the -20 from weakened.
But it also has a con. Three out of five high dragons are immune to the corrode damage type (Sky, Turi and Gafo).
While Adra dragon specifically, has the same DR against corrode and deflection.
Btw, is it possible to slow a dragon?
The default run speed is 4. Adra Dragon is also known for being slow, so it probably has movement speed of up to 3.
And hobbled slows by 3 units.
-- edit --
Just tested. Hobbled Adra dragon is basically pin pointed to place for the duration.
And can be decimated from distance.
Edited by MaxQuest, 19 May 2016 - 11:36 AM.