QUOTE(ic no 851025071234 @ Oct 9 2017, 10:03 PM)
I have summon 12 using rare summon ticket. Never use the standard before. I thought rare will more powerful than standard. Again what is best use for the lapis? Should I use all for summon?
Try not to use lapis to continue mission. If you lack good units, then summon is a good idea, but probably see what is on the banner before doing so.

If you got unit with good TMR, then using lapis to refill energy is not bad too.
Right now, there is a free summon at standard tab, but the unit is actually rare units. It is free once a day for 10 days, starting today. Also, there is a guaranteed 5 stars ticket, claim it from your mailbox. Personally, I would say use it straight away, but it's up to you if you want to use it now or keep for later.
Some people will recommend re-rolling ( keep starting new account until you get what you want ), but it is quite tedious. It give you a head start if you have one good unit, but again quite tedious. I didn't do it, but just letting you know your options.
Regarding equipment, if you have good friend unit, maybe they can help you clear the first trial, that will give you a 82 ATK sword, which is the best non-TMR sword for now.