After the cutscenes, you’ll find yourself in an alternate dimension and you’ll have to face another boss called Thoras the Abomination. Similar to the last battle, only your melee fighters are in danger. As long as Miki's at a safe distance, she'll do a good job in keeping your melee attackers alive. Thoras has a wide reach and it can damage multiple targets when it trashes about. Like before, have Fiore cast Sacred Pain then pummel it with elemental spells. For your melee attackers, there's no use of playing defensive; just go all out and attack whenever you can.
After the battle, continue forth and you’ll find a rift which you can use to travel to Fidel’s House and back. Use it for now so you can rest in Fidel’s house and save your game. Also, your Communicator will work here and will allow you to normally travel in locations like you normally do in Faykreed. When you don’t have any last minute business to take care of, use the rift again in Fidel’s home to return to Kronos’s Sickle.
Kronos’s Sickle
The area doesn't have a map nor chests but it's pretty short and straightforward. However, you'll still have to deal with some mini-bosses to test your mettle. Starting from the rift, operate the transport pad where the rift is to reach the next area. There’s another mini-boss waiting for you there. The Forsaken Beast isn't a mini-boss but it's still very dangerous. As soon as the battle starts, it will fire a powerful beam that can damage all characters in its path. If several members of your party is hit by it, take control of Miki and take control of the immediate healing. The combat area is rather small so you have to make sure that your non-melee fighters don't get caught in the fray. This enemy's HP isn't that high so you can get rid of it in less than a minute with continuous attacks.
Continue again to the next transport pad and clear the path ahead. The next challenge you need to overcome is a pair of Harbingers of the Apocalypse. As soon as the battle starts, they may charge towards you, knocking down any character in their path. They're quite mobile and they have good reach but fortunately, their HP isn't that high either. Even when not focused on a single target, your party should be capable of eliminating both at the same time without any difficulty, unless you're pretty under-leveled and under-equipped before the main game's final boss.
After getting rid of the Harbingers, continue forth and clear another path. Use the next transport pad to face the Bane Dragon. This sturdy mini-boss has a higher HP than the other mini-bosses in the Sickle and has more area-of-effect attacks. It's Bellow can damage multiple characters in front of it and it's ground slam can damage and knock down anyone around it. As long as you keep your ranged characters safe from a distance, your melee fighters can soak up the damage and keep the dragon busy.
After defeating it, continue to the last transport pad leading to General Alma’s base. Save your game then proceed forth.
Tip: Manipulating the ending
At this point, you can deliberately manipulate the ending you want to see in the game (and unlock the corresponding trophies for them by forcing characters to take multiple dosages of Love Potions and Emotional Destabilizers. If you triggered all Private Actions for all characters and chose the best responses to PAs, Relia and/or Miki will have the highest affinity towards Fidel. Feeding them with Emotional Destabilizers will sour their relationship with Fidel at the same time giving Love Potions to the characters you want to see the ending with will drastically increase their affinity enough to change the ending. More about this is discussed in this page.
When ready, proceed forth to trigger a cutscene. Shortly after the final fight against Alma will take place.