The event last until 14 August 2016 (PST Time).
The main goal of this event is to create Rod of Gravity.
It has +5 Atk, +35 Mag, and will grant you an ability to cast Gravity (1/2 HP damage to single enemy, unless it resist against it). A lot of enemies can be affected by gravity, however the boss usually resist against gravity type of spell, which make the gravity ability useless on boss fight.
At the time this post written, Gravity rod is the weapon that gives the most “+” to magic status (+35 Mag). The attack property is basically useless because rod is mages’ weapon, they use magic, right ? not normal attack (unless you have Firion/Bartz and equip them with this rod…. But why on earth you do that?).
You get it by crafting it on the forge. You get the recipe by clearing the “Demon Unleashed – INT“. Here’s the ingredients
 Massive Stone x 1
 Void Vessel x44
 Litrock x 66
 Earth’s Core x 66
 Demon Heart x 80
Ok, the first material Massive Stone. YOU CAN ONLY GET 2 MASSIVE STONE!! This mean that you can only get 2 Rod of Gravity. You get Massive Stone when clearing Demon Unleashed “INT” and “ADV” for the first time.
For Void Vessel you can craft it. You get the recipe from clearing Demon Unleashed – BGN. You need 5 Dark Cryst and 5 Farplane Souls (15 minutes and 500 Gil).
So,for the last ingredient, Demon Heart. This item is only available on the Demons Unleashed Vortex. You can get it from the Boss stage on this vortex. REMEMBER THAT the ADV difficulty always gives you at least 1 Demon Heart (more if you find Cutpurse and Footpad). Other difficulties’ bosses may drop the Demon Heart too but from my experience the chance is very small (especially BGN difficulty).. So, it’s better to go for ADV difficulties.
If you’re not able to defeat ADV difficulty then it’s better to get stronger first or enter the INT difficulty. The chance of demon heart dropping is quite fair there.
If you’re lucky, you may meet with Cutpurse and Footpad on the Demons Unleashed Vortex, they will give you Demon Heart. But they’re very rare from my experience.. (and you can only find 1 per wave; my experience not a fact , please let me know if you can find more than 1 in one wave). Remember that only cutpurse and footpad found on the “Demons Unleashed Vortex” that will drop Demon Heart. So, DON’T TRY to go to Dalnakya Plain and start beating those enemies (they’re boss on that palce 🙂 ) and hoping for Demon Heart.
I use Demon Heart as a basis, because you can only get it on this event. So let’s say that you only get 1 Demon Heart every time you enter the “ADV” difficulty. This mean that you need 80 (Demon Heart) x 15 (energy cost on ADV) = 1200 Energy. Which mean 1200 x 5 (1 energy every 5 minutes) = 6000 minutes = 100 Hours. This mean that you need about 4 – 5 days to gather 80 demon hearts (4 days and 4 hours for the exact time).
Let’s break it into smaller chunk. Let’s say that you only have 10 days for this event. This mean that you need to gather 8 Demon Heart each day. This equal 8 x 15 = 120 Energy => 600 minutes => 10 hours per day… If you want to create 2 Rod of Gravity this mean that you need about 20 hours per day….. So unless you want to rise up on midnight to spend you energy, I recommend you to only get 1 Rod of Gravity.
Of course. First, if you don’t realize then let me tell you that ONLY THE EVENT THAT’S LIMITED. The recipe will still be there even after the event ends. This mean that
 Focus on gathering Demon Heart!!! 80 Demon Heart if you only plan to create one, and 160 Demon Heart if you want to create 2. DON’T GATHER more than 160, because like I said on above that YOU ONLY HAVE 2 MASSIVE STONE. So as long as you have the Demon Heart then you can still gather other ingredients later (even after the event ends).
 Once you have gathered 80/160 demon heart, don’t enter the Demon Unleashed Event AGAIN. It’s far more effective to gather remaining ingredients on the story mode – exploration/chamber of awakening as you play the game because you will get other useful thing (such as magicite from the exploration).
Note: Demons Unleashed Vortex have a chance to drops all items below
Tips: You can also steal Litrock from all enemies on the “Demons Unleashed Vortex“. All enemies . (Thanks to Peter for this tips).
IMO, no. However that’s all depends on your party. I only need one because there is only one character in my party that use rod as their weapon (Other mages, Krile and Fina use staff because I use them for healing). My mage is Kefka, he already has his own gravity attack (Heartless Angel) which make the gravity useless. Not mention that Kefka doesn’t have fire base spell, so I prefer to equip my Kefka with Fire rod to give him Fira ability.
Also remember that if you want to get 2 rod of gravity you really need to make sure that you’re consistent with the usage of your energy. Let’s say in the end of this event you only manage to gather 150 demon heart, because you’re forgot to farm Demon Heart for any reason. This mean that you just wasted 70 x 15 = 1050 Energy…. without any real benefit…Actually there is a “benefit”, you get 20 gil x 70 demon heart = 1400 Gil not bad for 1050 Energy :).
You also need to remember that this rod takes 66 Litrock and 66 Earth’s Core, they’re quite rare and can be used for Hero awakening. You use about 3-5 Earth’s Core to awaken 3 to 4 stars hero, and about 10 Earth’s Core to awaken 4 to 5 stars. This mean you can awaken about 20 of “3 stars heroes” or 6 of “4 stars heroes”. Same thing for Litrock. So, yeah my conclusion is it’s only worth to create 1 Rod of Gravity.
Clearing normal waves
Strong: Dark, Poison, Sleep, Paralyze, Disease, Petrify, Blind (50%), and Confuse (80%). No resist on silence
Attack twice per turn. Attacks:
 Normal Attack: deal about 400 – 700 damage
 Silver Lance: deal double damage from the normal attack (deals 800 -1400 depends on your defense status
 Poison Mist: Inflict poison to all characters. From my experience, it’s rarely used so you can care less.
The battle is not hard because his attack is only target single unit (Poison mist is not direct damage so you have a time to recover from it). If you have power/full break then definitely use it because it will make it really easy. Guard break is also useful because the monster has high defense. Gravity doesn’t work here, so don’t even try :).
Those are all tips which I think that you need to know. If you get more tips (on gathering ingredients, etc) or questions. Simply leave them in a comment section below. Thanks for using my guide while playing.