Need help dealing 1m damage against ghost with mastiff armor.

[DrBeako]

Please note that this is an ironman profile, please post advice that are more accessible for ironman player. Thanks.
I currently deal about 80k damage against ghost.

DrBeako (Blueberry) ​

173/238 Fairy Souls ️ Heroic Dreadlord Sword ✪✪✪✪✪ Enchanting 34 Uncommon Blue Whale (Lvl 93) Slayer: 5 ️ 5 3 3 0 Catacombs: 21 ( 15 20 ️ 14 15 ️ 14) Avg Skill Level: 21.7 Senither Weight: 435 Lily Weight: 687 Bank: 8.6M Purse: 60K

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