On the one hand we have Foul throwing his entire being into the white gold in an effort to break the arch of time. Foul is so consumed with his effort, he attacks until there is nothing left of him. I'm sure we would all agree that an immense amount of power was release during his attempt to break the Arch of Time.
On the other hand we have a sleeping Worm of the Worlds End. This same worm was supposedly almost aroused when TC was lost in venom and WM on the Isle of the One Tree.
But in the end, Foul's efforts are thwarted, and the worm still sleeps. The fact that TC was able to absorb Fouls attacks does not mean there was no use of power:
from White Gold Wielder, Chapter 19 - Hold Possession: Lord Foul's retort was a bolt that sizzled the air like frying meat. Power fierce enough to blow off the crown of the peak sprang at Covenant, raging for his immolation.
and a few paragraphs later: He [TC] did not oppose it, made no effort to resist or evade the attack. He simply accepted it. The clench of pain between his brows showed that he was hurt; but he did not flinch. The blast raved and scourged into him until Linden feared that even a dead soul could not survive it. Yet when it ended he had taken it all upon himself. Bravely, be stood forth from
the fire.
Clearly TC protected the Arch of Time from Fouls attacks. But what about this worm? Unless the Worm really is the Arch of Time, it should have woken up.and a few paragraphs later: But Lord Foul was so far gone in fury and frustration that he might have been deaf. "No!" he roared again. No fear hampered him: he was transported to the verge of absolute violence.
"No!"
"N0!"
And with every cry he flung his utterest force against the Unbeliever.
Blast after blast, faster and faster. Enough white power to bring Mount Thunder down in rubble, cast it off Landsdrop into the ruinous embrace of Sarangrave Flat. Enough to leave the One Tree itself in ash and cinders. Enough to shatter the Arch of Time. All Lord Foul's ancient puissance was multiplied and channeled by the argent ring. He struck and struck, the unanswerable knell of his hunger adumbrating through Kiril Threndor until Linden's mind reeled and her life almost stopped, unable to support the magnitude of his rage.