Phantasy Star Portable 2 Infinity Discord Server
The rebirth system in Phantasy Star Portable 2 Infinity is another way of increasing your characters' stats. Unlike class types which temporarily boost your character's stats while you are using that particular class, boosting your stats through the rebirth system are permanent stat increases.
If your character's level is 50 or greater, you can rebirth the character. Rebirthing your character will drop your character's level back down to Lv1. As a reward, you're given points. Spend these points on permanent stat improvements mentioned above. You earn a lot more points if you wait until Lv200 to rebirth, however each level up gets progressively harder, so it's something to keep in mind.
In addition to obtaining points, your classes' type level cap increase as well. In Portable 2, the maximum type-level was 30. Infinity raises the max type-level cap to 50, but the only way to raise your type-level cap to 50 is by rebirthing.
The amount of stats boosts you can add are capped as shown in the 2nd chart below, however you can rebirth as many times as you want/need to obtain all the stat boosts.
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When you rebirth, the ONLY things that change are:
your character's level drops to LV1
your character's stats will permanently be boosted
your classes' level caps are permanently increased
EVERYTHING else stays the same (class type levels, photon arts, equipment, etc).
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Here is a chart showing the amount of points you'll be rewarded and by how many levels your level caps will be increased if you rebirth at a given level.
As you can see, there is a greater reward to rebirth at higher levels rather than rebirth at lower levels. However, take in mind the required experience needed per level significantly rises as you get higher and higher.
Decent places to rebirth seem to be at lv 200 (best), lv 170, 140 and 100, because they are the lowest levels you can earn a type-level cap increase. Beyond that point, you have to level up 30 or more levels before you get another increase in the class-type level cap boost.
So you can get max stats by rebirthing multiple times at different levels. Here are some scenarios: