Commander Zilyana is within God Wars Dungeon, and it is recommended to at least have Trollheim Teleport (Lunar) unlocked. You can also use God wars teleport or a Max Guild boss portal tuned to Commander Zilyana. From Trollheim, climb down the cliffsides go north past the thrower trolls, past the large rock, and down the entrance into the dungeon near the wolves. Once there, run east and climb down the rocks into Saradomin's Encampment - this requires 70 Agility, which is not boostable.