The explanation here is that your attempting to go with RuneScape

Explore in the Heart of Gielinor. Make time prior to the trip in order to attain level 80 defense. Use this Dormant Anima Core with the Crest of Seren and you can create it. The smithing rules are identical to those of the other armor sets, but you'll need 2,000 Seren faction reputation before you can begin refining the armor.

The armor sets mentioned previously are immensely useful If you want, there are other alternatives to look into. They are also applicable to combat, ranged as well as magic. We suggest looking for the Bandos armour, Armadyl and Subjugation armor from the first God Wars Dungeon. For Bandos armor, this is how you can go about it:

Besiege General Graardor and his bodyguards in battle in God Wars Dungeon. Grab it after they have dropped it after death. Increase your level until you reach level 65 defense. Armadyl armor is superb for players who are ranged and can be obtained in the same way in which you take on General Kree'arra with the three of his minions. Get the armor after their death. Increase range to 70. Increase defense until level 70.

Finally, Subjugation armor makes an awesome set for magic (prayer) gamers. You'll need to battle another boss to acquire it in the end, but if your been slaying in the God Wars Dungeon already, this should be an easy task: defeat K'ril Tsutsaroth and his bodyguards in the God Wars Dungeon. You can pick up the armor set after they've been killed. Up your defense to level 70.

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