Ilend Vonius is an Imperial Guard, and one of two guards found alive in the quest "Breaking the Siege of Kvatch." After killing the surrounding Daedra in the area, the Hero can choose to let him help them, or to send him back to Savlian Matius.
If he survives, he will assist them in the quest "The Battle for Castle Kvatch," and if he survives all Kvatch related quests, he will wander around Castle Kvatch, constantly thanking the Hero for saving his life.
When first talking to Ilend, you will find his disposition of the Hero is maxed out at 100.
The Hero learns they have to go into the Oblivion gate and shut it down in order to rescue Martin and the others.
"Thank the Nine! I never thought that I'd see another friendly face... The others... taken... they were taken to the tower!"
- It's all right. What's going on? "Captain Matius sent us in to try and close the gate. We were ambushed, trapped, and picked off. I managed to escape, but the others are still strewn across that bridge. They took Menien off to the big tower. You've got to save him! I'm getting out of here!"
- Fine. Captain Matius needs your help. "The Captain is still holding the barricade? I figured I was the last one left alive. Alright. I'll try to get out of here and let the Captain know what's going on."
- Hold on. I can use your help here. "You're right. You're right. I can't just leave poor Menian to his fate. If he's still alive we've got to try to save him. Alright. Lead the way. Let's find Menian and get out of here."
(If approached again)
"What's the plan?"
- Follow me. "I'm right behind you."
- Wait here. "Well... alright. I think we're better off sticking together, though."
(After closing the gate)
"You saved my life. You brought me back from hell. I won't forget it."
- Kvatch "It was a terrible night. I don't know how any of us survived. The whole city was burning."
- "When we're done with all this, we'll talk. If we're still alive..."