Zemouregal and Arrav are revealed fighting. You measure up to OSRS Gold carry him . You must then struggle Zemouregal solo. If he dies, you input a cutscene in which Zemouregal binds you. Just as you're going to die, the dying Arrav throws his sword at Zemouregal, and he kills him. Arrav expires too, and the aviansie kill the demons outside.
In this quest, I said a new room from the elemental workshop dungeon. Such a room does exist. It's across from the room with the electric chair, and has a body rune symbol on it. If you attempt to input, it says"locked, for now at least" If at any moment you die in the last raid on the staircase, you may come back to find everything where you left it, even though all wellness is going to be recovered. You must do the maze everytime.
Rewards: more Historical Magics charms (even some that are not just missile spells, but they are battle spells), some experience, Hazeel's one dragon weapon if you choose to pay to fix it. Accessibility to Lucien's tower where you could fight Nightmare Blades, that can shed their Twin Blades. They're a slayer creature. Get into the Zaros God Wars Dungeon. You receive Zemouregal's sword. If you lose it, then you do not get it backagain.
Ever. All quest weapons have a special. Hazeel's monster weapon uses two strikes, the first strikes anybody close to you, the next strikes the person you are facing. The Twin Blades is a normal attack that increases your stats. Zemouregal's Sword special strikes 5 occasions when used. The 5 attacks vary in fashion (crush, slash, accurate, controlled, etc.) but are all weak. Still, those are great weapons.
You can use the feathers in the begining to Old School RS Gold make Armadyl Gloves, which give such stats and count as Armadyl armor at the God Wars Dungeon. Also, in Meiyerditchthere are a couple of vyreguards and vyre lords. You need Eucalyptis or better pyre logs to burn vyreguards, and magic pyre logs to burn vyrelords. They give better rewards than vyrewatches.