I’m going to post a short post on tips and strategy for Convocation of Thunder EX for now. Will add to it as more people comment with other tips. Some of you may not have any trouble beating this, but others might need some advice so here it is.

This quest is restricted to only Thunder units, so you will need to have a decent mono element team.

The main threat in this map is Teona. She is very bulky (10k HP) and can buff her PDEF, and has an AoE skill that scale according to her PDEF. She is susceptible to bind and paralyse (42% and 45% resist respectively) but nothing else. First turn Teona always move closer to you. Second turn she might use Dragon God Roar (double Pierce damage and raises PDEF to 1400ish) if your units are out of range or an AoE if they are in range. Definitely do NOT let her buff herself (or null wave her if she does) as her next turn she will use her PDEF scaling AoE attack which deals 4-7k damage.

When a Teona HP drops, more enemies will spawn in the following order:

• first hit when Teona does her first attack, Water Mandragora and Seida will spawn (read u/Alittlebunyrabit’s comment below for Lotiyah strat). Mandragora will take 2 turns to cast global Slow, other than that it’s not much threat. ACDB shows a lot more skills it can use but I’ve not let it live that long to see. Seida uses an AoE poison, but she isn’t much threat either.
• second threshold spawns Lizardman, Ravina and Fung Liu. Ravina can do a Wind elemental ranged attack, but she’s not too much threat as she’s Water element. Lizardman can be stopped.
• third threshold spawns Letitia and Lofia. Lofia casts quicken and overclocks, and when out of gem she just do normal attack. Letitia just uses magic spells (and a DEF buff skill), like Fung Liu.
• if you cross multiple thresholds all the enemy units will spawn at once. Don’t do this as you’ll easily get overwhelmed by too many enemy attacks.

My strategy was to use Deneb. She can zero Teona’s CT 3 times, and Deneb will always cast her CT reducing skill before Teona moves. That will give you some breathing space. You can also Bind or Paralyse her for extra safety.

I killed Balt, Cordelia, Seida, and Mandragora first, before taking Teona down to next HP threshold. The above strategy helps neuter Teona while I kill everyone else. Once those have been killed I focus on Teona to kill her before moving on to the mages, which isn’t much threat.

My team:

• Deneb for the CT reducing skills, and minor magic damage once they are used up. Mine’s LB25 but only single JM.
• Rox (surprise, surprise) for her WA and Point-Blank shot that inflicts Bind. She deals decent damage and heals herself. I put Rainbow armor on mine instead of Regen armor. Mine’s at LB11.
• Gerald (he is MVP here). Mine’s at LB13. His LS gives 50% HP and 20% Pierce. Run double Gerald and this map is a piece of cake. His charge up and attack also deals a lot of damage. He also has a 3x3 AoE for the 4 kills achievement (use it at the end, when you lined up Letitia, Ravina, Fung Liu, and Lofia).
• Fujika. Very squishy, but she casts almost instantaneous quicken and overclocks. She can also Black Hole Teona when Deneb runs out of skills. LB24, triple JMed but no enchanter JE. I have Regen armor, curious doll and Battlefield drama on mine. I keep Fujika at the back quickening everyone. Seida goes for her and deals about 500 damage each time, so isn’t too bad.
• merc enlightened Gerald. He basically carried my team.

I got no death, no items, 5 units, use merc achievement in 1 go with the above team. You could also get 4 kills achievement using Gerald if you’re patient/lucky enough to not let anyone die.

Other units that may be useful:

• Teona. Tanks decently but she doesn’t deal much damage otherwise. (Teona JE when??)
• Vanekis J , Vier, etc. I find mages too squishy, but using magic might be a strategy for damage as Teona doesn’t buff her MDEF. Vier skills are Thunder element though, so you might have trouble killing Balt and Cordelia.
• Sovereign. I only have her at LB10 but she might be good support. Also, Max Speed Wind Flash!!

If anyone else has anything to add I’ll edit this post as we go along. Sorry for the not F2P friendly guide, but you might get an idea how to do it after reading this.

Good luck everyone!

PS - For Convocation of Wind, just bring magic swordsman and stone everyone. The enemies don’t really pose much of a threat here (except Nefertiti, but you can use Balt’s Zeal Eater to drain her jewels and she’ll become harmless ;)