You will have to head to the Vile Peaks 10 AF time zone to continue the quests that you began in the 200 AF time period. Three Fragments for the Honor of Blitz Squad quest line are in this area. You can find the Baxter’s Last Light Fragment by performing a Moogle Hunt in the northwest of the Another Man’s Treasure zone to reveal Baxter. Talk to Baxter to get the Fragment and begin the Ray’s Last Light side quest, which plays out in basically the same way.
To find Ray, head to the far east of the Dismal Dunescape area. You can find this NPC without using Moogle Hunt, so it should be easy. Speak with him (he will only talk to you if you have the Falcon’s Compass Fragment from the 200 AF time) to get the Ray’s Last Light Fragment along with the Twilight Fragment Alpha side quest. You still have to collect one more of the Last Light Fragments, but you cannot do this until you finish the Twilight Fragment Alpha quest by defeating Twilight Odin. Head to the Wrack and Ruin area, level up your party if necessary, and prepare for a battle. When you’re ready, enter the anomaly on top of the mound.
Boss Battle: Twilight Odin
You’ll want to have a Synergist in your party for this battle to offset some of the damage that Twilight Odin will deal to you. Use the Aggression Paradigm for the first few seconds just to bring Twilight Odin’s Chain Gauge up, then switch to the Malevolence Paradigm to cast buffs on your party while using the Ravagers to keep the Chain Gauge moving at a steady rate. Cast Shell on your party.
Once the buffs have been applied, switch back to Aggression to continue driving Odin’s Gauge upwards. Once he is almost staggered, heal your party and switch to the Smart Bomb Paradigm. Use Deprotect and Deshell to weaken Twilight Odin before you stagger him, and then switch back to Aggression. Cast Blizzara and Aerora to increase the chain bonus even more. Switch to Cerberus to stagger Twilight Odin and attack mercilessly to bring him down in one stagger.
For beating Twilight Odin, you will obtain the Twilight Fragment Alpha and 3,000 experience points. Leave the battle area via the path to the west. You will find the Sergeant in the west side of the Wrack and Ruin area by using a Moogle Hunt. Talk to him to get the Sarge’s Last Light Fragment.