Perhaps, in Trell's case, the term "Ritual" might be a bit misleading. He brought power and lore to the table, but not the specific lore to do the same exact thing Kevin did. Trell's ritual was despair and instinct and anguish become power, accidentally and perhaps instinctually becoming similar to what Kevin did.In [u]The Power That Preserves[/u] was wrote:If he were not stopped, the gates would only be the first part of the Keep to break, the first and least link in a chain of destruction which might tear the whole plateau to rubble.
The Old Lords? I think that they could have performed the Ritual. If Trell could, they could. And they were not bound by the Oath of Peace.
The Old Lords simply never reached such despair as Kevin had.
But I agree with HLT that, unlimited, they used a heck of a lot of power. Power to devestate the land where battles were fought. But I would add that Foul and his minions were weilding power, too. It was the combination of the two powers in opposition, with the Ritual happening on top of it afterwards, that so mangled the lands like Kurash Plenethor.