Summon Your Eidolons With Care
Eidolons in Final Fantasy Type-0 HD are a tricky business. Summoning one requires you to sacrifice the life of one of your party members, adding to the casualty count on your mission report. As a general rule of thumb, only use Eidolons as a last resort. When it seems like your squad’s about to give out, summon an Eidolon to give your two other party members time to recuperate.
You’ll also need to make the difficult decision of who to sacrifice. Cinque and Jack are pretty good sacrificial candidates, given their slow speeds. Though these two characters do have a high attack stat, their low mobility rate will be a detriment in battle unless you level them up.
But here’s an interesting trick to get around the whole ‘sacrifice’ portion: use Rem. Once you’ve leveled her up enough, Rem can unlock an ability called Undying Wish that allows her to cast Reraise on all party members for a short period of time. By casting Reraise and then summoning the Eidolon, the fallen party member will come back to life. However, do note that this will still add to your casualty count.
I’m not a very huge fan of Eidolons as it’s just so much more interesting to experiment with your cadets’ abilities. But if push comes to shove, use them as a last resort, a final ace in the hole.