When you pick an immortal at the immortal hall, it says: "Scrifice limit:0"
Anyone knows what that means?
I'm not a good explainer so let's look at the example here;
I've Lancer(C) x2 and level them to their max @ lv.20.
Then, I evolved them together (Lancer lv.20 + Lancer lv.20).
I'll get Lancer+(C+) with "Scrifice limit: 1 Time".
(Let's says just keep a record of it)