Quote Originally Posted by nezzal View Post
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1. The little orange "+2" number etc in the bottom left of the Eidolons. What is it and how is it increased.
Each + is 3 Atk and 1 HP more stats. These are moved if you use that Eidolon to Enhance another. So combining one +2 with another +2 gives you a +4. These go up to +99 per item.

You gain a few +1 weapons and Eidolons from Gem Gacha every day, a fair bit from raid Gachas (raid tickets) and tons from Premium gacha.
Quote Originally Posted by nezzal View Post
2. Sometimes in a fight it will mention a quick summon and the summon time on my main Eidolon is decreased. How is it triggered?
It's a random drop, just like potions. This random drop reduces to summon timer on your primary Eidolon by 5 turns.
You'd much rather have a potion, really.
Quote Originally Posted by nezzal View Post
3. Is there anything I need to watch out for in terms of weapons? I know about the primary weapon, but what about the rest. Should I try to make them all match my main element or just go for highest rarity? and does the order of the weapons matter at all?
What do you know about the primary weapon?

Ultimately, your goal is to have max skill level Assault in every slot of the same element - SR or higher. You can get those from Disaster raids, but event weapons are generally better. Your Grid - leveled up skill levels equipped - is THE most important thing when it comes to your damage output.

Order only matters for Relic weapons, as those are special. Their skill only activates when they're in the main slot, and only for the matching Soul.