Braccus Rex's key and chest

[Whiskeyjack]

So, looting after Braccus Rex battle I found a key named something along the line of "Braccus Rex key".I thought it opened the chest in that room,he one named "Source King's chest" but it didn't work.Having no idea what to do,i searched on the internet,it seems you need not ony said key but also a spell you can buy from Arhu,I checked and Ahru has not suck a spell.So,i don't know how to open that chest.
Enlighten me

[rn_archl0rd]

The key you found opens the chest to the right of the room. The key to the chest with the magic lock (green) will be found much later in the game. When you opened the chest with the key you found you should have gotten a star stone that immediately healed all and became inert. There is no spell for opening magic locks. You have to use a magicl open scroll. Arhu has one in his room and you will find two (iirc) later in the game.