There are 300 optional missions in Crisis Core Final Fantasy VII: Reunion. The Pursue the Remnants sub-category (M4-1) can be found in the To End the War with Wutai Category.

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Mission 4-1-6 is a difficulty spike when taking it on early in the game.

To End the War with Wutai: M4-1 Missions¶

Once you reach the start of Chapter 2, you’ll unlock a bunch of new Missions when you reach the next Save Point. The To End the War with Wutai category of Missions will also unlock at this point, alongside the Pursue the Remnants sub-category.

As you may expect from the name, these are all focused around taking on the Wutai-based enemies you fought through Chapter 1. While you can undertake all of this category as soon as you unlock it in Chapter 2, the final mission is a bit of a roadblock and requires a bit more preparation.

Mission	Unlock	Rank	Enemies	Rewards
4-1-1: Wutai Units Found	During the story at the start of Chapter 2	1	Foulander, Wutai Private, Wutai Sergeant	Elixir
4-1-2: Anti-SOLDIER Monsters	Complete Mission 4-1-1	1	Vajradhara Wu, Vajradhara Tai, Wutai Private, Wutai Sergeant	Bulletproof Vest
4-1-3: Pursue the Deserters	Complete Mission 4-1-2	2	Balo Balo, Wutai Soldier Jia, Wutai Staff Sergeant	Libra Materia
4-1-4: Wutai Remnants in the Slums	Complete Mission 4-1-3	2	Balo Balo, Wutai Soldier Jia, Wutai Staff Sergeant	Muscle Belt
4-1-5: Stop the Intruders	Complete Mission 4-1-4	3	Wutai Corporal, Wutai Soldier Yi	Mute Shock Materia
4-1-6: Search for Wutai Remnants	Complete Mission 4-1-5	4	Vajradhara Cala, Wutai Sergeant Major, Wutai Soldier Bing	Poison Blade Materia

The first set of missions here are nothing major and you should be able to brute force them easily. You’ve fought plenty of these Wutai Soldiers in Chapter 1 and the Jia’s and Staff Sergeants are just slightly harder hitting versions of them, the same tactics will work here.

The main difficulty in this sub-category, and one that catches out a lot of new players is the final mission (M4-1-6) here, Search for Wutai Remnants. Despite being a 4 Star mission that you may have already done in other mission categories early on, the boss here can be a real difficulty spike. The Vajradhara Cala’s Tomahawk special will most likely kill you in one-hit unless you prepare for it. Do so by equipping HP Up Materia, using Barrier (since it’s a physical skill) and equip any accessories that boost your VIT (such as the Bulletproof Vest). As for damaging it, use magic like Fira to take massive chunks of its HP off at once, just remember to bring some Ethers.

Completing this sub-category will unlock the Mission 4-2: Behind the Scenes sub-category.