Howdy,
This guide will be teaching you how to kill Commander Zilyana (Saradomin) with ease. In order to kill Zilyana, you will need an agility level of 70 - Using stat boosting potions or foods will not work!
Commander Zilyana can be killed with all combat styles, Ranged, Magic and Melee. Unfortunately, I won't go over every possible method such as using melee 2H to kill Zilyana.

Ranged
Despite the excellent magic defence it provides, it has very poor melee defence, resulting in heavy hits from Zilyana and Starlight.

Item (most effective → least effective)
• Helmet; Sirenic Mask  → (Superior)Death Lotus hood → Pernix Cowl → Armadyl Helmet.
• Body; Sirenic hauberk, Death Lotus chestplate → Pernix body → Armadyl chestplate.
• Bottoms; Sirenic chaps → Death Lotus chaps → Pernix chaps → Armadyl Chainskirt.
• Boots; Glaiven Boots → Pernix boots → Armadyl boots.
• Gloves; Ascension Grips → Tracking gloves → Swift gloves → Pernix gloves → Armadyl gloves.
• Amulet; Amulet of Souls → Farsight Sniper Necklace → Saradomin's murmur → (Blood) Amulet of fury.
• Cape: Completionist cape → Max cape → TokHaar-Kal-Xil → Skillcape
• Weapon; Noxious Longbow → Ascension Crossbows → Attuned Crystal Bow^{99 Agility} → Zaryte bow → Chaotic C'bows.
• Ring; Ring of death → Asylum Surgeons Ring → Sixth-Age Circuit → Ring of Wealth
• Aura; Penance → Reverence → Vampyrism

An example of a dual wield ranged ability bar:


Inventory - This is how you should want your inventory to look.
• Orange = Room for loot.
• Light blue = Replaceable with whatever potions you have available.
• Red = Spring cleaner - This is good for crushing any runite drops.

*A pack yak should be filled with the best food you have

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Melee
Melee equipment has good melee defence, but very low magic defence; players using melee equipment will find themselves having a harder time defending against Zilyana's magic attacks.

Item (most effective → least effective)
• Helmet: Malevolent Helmet → (Superior)Tetsu Helmet → Torva Full Helmet → Bandos Helmet.
• Top: Malevolent → (Superior)Tetsu  platebody → Torva Platebody → Bandos Chestplate.
• Bottom: Malevolent → (Superior)Tetsu platelegs → Torva Platelegs → Bandos Tassets.
• Gloves: Pneumatic Gloves → Goliath gloves → Torva Gloves → Bandos Gloves.
• Boots: Steadfast boots → Torva Boots → Bandos Boots.
• Amulet: Amulet of Souls → (Blood)Brlawer's knockout necklace → (Blood)Amulet of fury → Saradomin's whisper.
• Cape: Completionist Cape → Max cape → TokHaar-Kal-Ket → Fire Cape.
• Weapon: Drygore Mace/Rapier/Longswords → Chaotic Longswords.
• Aura Penance → Reverence → Vampyrism.
• Ring: Ring of Death → Asylum's Surgeon Ring → Leviathan Ring → Ring of Wealth.

An example of a duel wield melee ability bar:


Inventory - This is how you should want your inventory to look.
• Orange = Room for loot.
• Light blue = Replaceable with whatever potions you have available.
• Red = Spring cleaner - This is good for crushing any runite drops.

*A pack yak should be filled with the best food you have

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Magic
One of the popular ways to kill Zilyana is with a spell with high-levelled magic equipment, as it provides decent magic and melee defence, which will ward off her attacks better.
Players are recommended to save up adrenaline for Sunshine, otherwise kills will take too long and end up with shorter trips.

Item (most effective → least effective)
• Helmet: Tectonic Mask → (Superior)Seasigner Hood → Virtus Mask → Hood of Subjugation.
• Top: Tectonic Top → (Superior)Seasigner top → Virtus top → Garb of Subjugation.
• Bottom: Tectonic Bottoms → (Superior)Seasigner Bottoms → Virtus bottoms → Gown of Subjugation.
• Gloves: Celestial Handwarps → Static Gloves → Spellcaster Gloves → Virtus Gloves → Gloves of Subjugation.
• Boots: Ragefire Boots → Virtus Boots → Boots of Subjugation → Warpriest Boots.
• Amulet: Amulet of Souls → (Blood) Arcane Stream → Dragon-Rider Amulet → Saradomin's hiss → Blood Amulet of Fury.
• Cape: Completionist cape → Max cape → TokHaar-Kal-Mej → God Cape
• Weapon: Noxious Staff → Staff of Darkness → Attuned Crystal Staff → Chaotic Staff.
• Aura Penance → Reverence → Vampyrism.
• Ring: Ring of Death → Asylum's Surgeon Ring → Leviathan Ring → Ring of Wealth

An example of a 2H Magic ability bar:


Inventory - This is how you should want your inventory to look.
• Orange = Room for loot.
• Light blue = Replaceable with whatever potions you have available.
• Red = Spring cleaner - This is good for crushing any runite drops.

*A pack yak should be filled with the best food you have

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I hope that this guide helps and inspires you to take on bossing! If you'd like to see what items Commander Zilyana can drop, please click this link that will take you to the wiki. >Zilyana Drops<
With help from the RS Wiki

You should apply for the guide writing award

Thanks for guide!!