Weakened? That's a possibility, though the point is debatable. But in any way diminished or downhearted - definitely not. Ellyana fully accepted that there might be consequences when she used the power of her cloak to cleanse the armoury beneath the castle at Dundee.

It was a long, hard fight to dislodge the demons that had taken up residence in the castle of the Iron Order. The portcullis was closed to us. Access from the tunnels of UnderValorn was blocked. We knew that Sir Pestus had fled, and could only hope that he had found safe refuge somewhere. From our initial attempts to dislodge the portcullis, through the castle and down to the armoury, we faced fierce resistance every step of the way. All those involved fought until they could not risk another blow, or fell and found the favour of the gods to reform at a monument and continue the assault. Combat was relentless as we forced our way through the darkened edifice. The high points came, spirits raised and darkness seemed to lift as one by one the fearsome demonic creatures we faced were brought down.
At long last we cleared the armoury, the point where the foe made their final stand. And then there was time to catch a breath, to look around and see what the demons had wrought down in their induced darkness.
Many of the weapons and shields had been melted down in a roughly-built forge. Containers of metal, almost coffin-shaped, scattered the armoury, leading to a suggestion that the demons were trying to create their own dark Order. Everywhere were piles of metal, and the floor was covered in a thick ooze that emitted bubbles of noxious gas.
Much discussion ensued as to how we might cleanse the place. As we spoke the gemstone at Ellyana's throat, graced as it is with a precious drop of 'Rifterian blood, began to glow, leading to suggestions that she could use the power of the gem, and the strength of nature imbued in the cloak which the gemstone fastens, to clear away the traces of evil.
We gathered all the metal into one heap. Light was cast all around, and Ellyana prayed, one hand above the tainted metal and the other clasping the gemstone.
Suddenly light lanced out between her fingers, shining forth from the gem, light which boiled away the ooze into nothingness and melted away forge and containers and metal. As the light blazed forth, Ellyana was thrown back, crashing into the wall behind her, I didn't see at first what she had done, being more concerned as to whether she was injured. I was relieved to find her only hurt was a lump on her head. She too was relieved that there was little physical damage. Not to her at least. But that gemstone has lost some of its strength, and half the blood contained within has disappeared.

Even so, Ellyana knows that the sacrifice was worthwhile. The castle is reclaimed and cleansed, and Sir Pestus has returned. We can examine ways of making up for the damage caused to the gem. As for the blood ... I don't know. That blood was gifted to her by the gods, clearly to be used in dark times. And what is gifted once can be gifted again, if it be used for the good of the lands and those that labour to keep them free and safe. Or perhaps that moment in the armoury was the moment for which the gift was given. I can't pretend to understand - though I can wonder and think on the possibilities. As ever, my lady gave what she could for the good of all. And that, in itself, is the mark of the heroes of these lands. To give with no regret or thought of the cost, to keep fighting, to maintain the struggle we face each marc.