Dimensions End: Entropy - Tier 7. This tier is HP Damage & Debuff Heavy. The enemies an one-shot you if you get broken. Their debuffs are Ability Silence, ATK/MBRV/IBRV/ DEF Down and Poison. The recommended roles are Tanks and Debuff Evasion. The bosses' total HP is 5,105,000. The turn requirement is 105. The DPT you need is 46K.
Wave 1 (Trash Wave)
Trash wave consisting of two (2) Imps that can inflict confuse and one (1) Killer Bee that can inflict poison.
Wave 2 (Boss Wave)
Fight is similar to Rosa Boss - Crust Beetles. Watch out when the enemy uses Hatred Power (enraged state that removes all debuffs on itself including framed) as any succeeding BRV attack that breaks you will trigger an HP Attack guaranteeing one of your characters to die. As such, do not get broken.
Having a tank is highly recommended. But do note that they have IBRV Down debuffs so if you are not careful, your shield/s can get broken. When one of them dies, the other enters in a more powerful enraged state Hatred Power+ so you want to kill them together as much as possible.
Enemy Debuffs: INT BRV Down, ATK Down, Poison
Wave 3 (Final Boss Wave)
Last Wave is the Kaiser Behemoth. Pretty tame early on but when it takes enough damage (~80% HP remaining), it stands up and restores all HP, removes own debuffs (frames included) and raises ATK and DEF.
Note that the enemy targets the character with the HIGHEST HP until it inflicts a debuff. You use this mechanic to your advantage (ie. Eight's evasion buff).
The enemy's debuffs puts you on a great disadvantage making you deal less damage, and hurting your turns. This is why units with Debuff Evasion and Tanking ability will do well in this fight.
Enemy Debuffs: Fog, ATK/MBRV/DEF Down
Most Used Units. Zack leads as the most used unit for this tier. Him being both a great tank and dealing high DPT is amazing. Ignis comes next with his debuff evasion aura, battery and healing. Rosa with her amazing auras and HP healing. Sephiroth, Rinoa, Yuri, Eight and Golbez all for their high DPT. Warrior of Light is an alternative tank for this tier. Eiko with her buffs and frequent HP healing. Tifa with her ST DPT and launch.
EX Only Units. Debuff Evasion is the name of the game and units with such capabilities shine even with their base EX such as Lenna, Aphmau and Selphie. Also throw in there Sherlotta as she is amazing just as she is.
Summons Used. Brothers are popular as you'd want to capitalize on boosting your mBRV with high DPT carries.
Top Unit. Zack is no doubt the top unit for this tier. With him by your side, you almost don't need to worry about your team being wiped with this tanking abilities. He also has great DPT but he does need additional support with the likes of Ignis and Rosa. Additional DPT are also welcome like Sephiroth, Eight and Golbez. An alternative tank is Warrior of Light.