This is one of the quests available in the prologue. It is a time-sensitive quest, so it's best to complete it fairly quickly - but due to a tough fight, you'll need to prepare for it a bit. You can start it by talking to Gavril, whom you'll meet on your way to Anca's hut.
Even though I lived in Laslea my whole life, the area around it still held many secrets. Some of them buried deeper than others...
Lazar headed out to the bogs to gather some peat, I should start my search there.
Head to the marshes located to the north and examine the cart Gavril mentioned, which you'll find there.
Seems like Lazar ran into some sort of danger. I've got to follow his tracks.
Follow the footprints and kill the two wolves they lead you to.
Lazar's tracks led me to the cave entrance. He must've fallen in there.
Jump down - you wont be able to go back this way.
Pick up the contents of the Lazar's backpack lying on the ground, along with a torch you can use to light up the dark. Continue forward - after passing through a narrow crack, you'll find yourself in a cave where you'll meet Lazar if it's the first half of the day, or find his corpse if it's later.
I need to find a way out of these ruins.
Head forward, and after a moment, you should reach an oval chamber with a large sarcophagus in the center and paintings on the walls. Check all the paintings,...
...and you will then be able to examine the sarcophagus and collect its contents. One of the items you'll find inside is the Mirelef Bracers (Master Light Bracers - Claw Art Ability, -7% Block Stamina Cost; +2% Weapon Critical Hit Chance).
In the next room, a fight awaits you with The Forgotten Guardian. This is a tough fight because this mini-boss frequently uses unblockable attacks.
Once you defeat him, you'll be able to loot his sword - the Undead Warrior's Sword (Superior Shortsword).
You can make your way outside through the narrow crack at the end of the tunnel.
I should tell Gavril about what happened.
After leaving the cave, return to Gavril - either together with Lazar or on your own - to inform him of what happened and claim your reward. If Lazar is alive, you will receive 250 XP and 50 Denarii.
If you met Lazar alive in the cave:
I found Lazar alive and led him out of the ruins. What a dreadful place it was!
If you were too late and Lazar was already dead.
I found Lazar - but I was too late. I need to tell Gavril of his passing.
