Wow @GillyTook, that is a GREAT prize! Not having played Legends and Letters I didn't know about it, so I had to look it up over at JN.
So while the attack is rather weak, 9 total icons. The defense is amazing! It blocks 100% of BOTH Physical AND Darkness! It also heals 3-30hp. I'm not sure if this is PER turn or not, but there doesn't seem to be an indicator of "one healing item at a time" so you can most likely equip it WITH a healer.
Yes, Sword of Malum is almost as good as the anagram swords in the Hidden Tower. So definitely keep that in your line-up! It sounds like your set is more versatile now. that's good. When the battle plot starts, you should be set up to go pretty far! For defense, I would recommend a Downsize! from the Defence Magic Shop. As it blocks 50% of all damage once per battle. Downsize looks like this.
https://items.thedailyneopets.com/items/downsize
It's an r68 and restocks frequently. Usually sells in Player shops for 3k-5k. So you can buy it from a player shop or the Defence Magic shop in the Neopia Bazaar.
Congrats on the GREAT very cool weekly prize! lol I hope I get a chance to earn one from the weekly prize pool one of these days!