View source for Lv

=XP per ☆=
[[File:XP_Star_1star_portraits.gif|thumb|{{Star|1}} XP stars]]

In order to raise the base level of a companion, either you gain XP through battles (slow), or you "feed" them XP stars. <!-- feel free to properly translate the name -->
Matching attributes yields a 20% increase in XP gains (example: Moritaka, {{Attribute|Water}}, gains more XP using {{Attribute|Water}} XP Stars than other colored XP stars).
{| class="wikitable sortable" style="text-align:center;"
!Star Size
!XP
!XP (Matching)
|-
|1☆ (Small)
|20
|24
|-
|2☆ (Medium)
|80
|96
|-
|3☆ (Large)
|320
|384
|-
|4☆ (Super)
|1280
|1536
|}
==XP Boosts==
Occasionally, you may experience higher than usual XP gains when leveling this way. Currently, probabilities require extensive testing (which requires <em>a lot</em> of resources). It can be inferred that Failure is exclusive to [[Skills]] leveling.
{| class="wikitable sortable" style="text-align:center;"
!Success
!Probability
!Multiplier
|-
|Good
|?
|100%
|-
|Great
| ?
|200%
|-
|Fever / Awesome
| ?
|300%
|}

=Coin Cost=
While fast and convenient, leveling this way comes at another cost: coins. As expected, the amount of coins required to gain XP has a base cost of 100 coins per XP star, and is proportional to the current level and the number of XP stars you're using.

<math>
\text{Required coins}=(\text{Number of Slots Filled}(20*\text{Current LV}+100))
</math>
<!-- Translate: 素材のサイズに拠らず、また最低でも100掛かる上現在LVに依存するので
細目にレベル強化するより大きい素材を揃えてから一気に強化した方がコインは節約できる。-->

=Level Limits=
Each character has a level limit dependent on their rarity (3☆ characters have the same initial limit, but different from 4☆ and 5☆ characters); however, these limits can grow by limit breaking a character. You can limit break all characters, regardless of rarity.
{| class="wikitable sortable" style="text-align:center;"
!☆ Rarity
!1st Order
!2nd Order
!3rd Order
!4th Order
|-
|1☆
|20
|30
|40
|50
|-
|2☆
|25
|35
|45
|55
|-
|3☆
|30
|40
|50
|60
|-
|4☆
|35
|45
|55
|65
|-
|5☆
|40
|50
|60
|70
|}

=XP per Level=
Below are charts graphing the amount of XP required to reach a level, and the deltas between levels. This XP curve is static between characters (as in, everyone has the same level of progression).
{| class="wikitable sortable" style="text-align:center;"
!LV
!Total XP required
!ΔXP
|-
|1
|
|12
|-
|2
|12
|15
|-
|3
|27
|27
|-
|4
|54
|36
|-
|5
|90
|50
|-
|6
|140
|80
|-
|7
|220
|100
|-
|8
|320
|130
|-
|9
|450
|150
|-
|10
|600
|200
|-
|11
|800
|250
|-
|12
|1050
|350
|-
|13
|1400
|400
|-
|14
|1800
|550
|-
|15
|2350
|650
|-
|16
|3000
|700
|-
|17
|3700
|750
|-
|18
|4450
|800
|-
|19
|5250
|850
|-
|20
|6100
|900
|-
|21
|7000
|950
|-
|22
|7950
|1000
|-
|23
|8950
|1050
|-
|24
|10000
|1100
|-
|25
|11100
|1150
|-
|26
|12250
|1250
|-
|27
|13500
|1400
|-
|28
|14900
|1500
|-
|29
|16400
|1600
|-
|30
|18000
|1700
|-
|31
|19700
|1700
|-
|32
|21400
|1800
|-
|33
|23200
|1800
|-
|34
|25000
|1800
|-
|35
|26800
|1800
|-
|36
|28600
|1800
|-
|37
|30400
|1800
|-
|38
|32200
|1900
|-
|39
|34100
|1900
|-
|40
|36000
|1900
|-
|41
|37900
|2000
|-
|42
|39900
|2150
|-
|43
|42050
|2200
|-
|44
|44250
|2300
|-
|45
|46550
|2400
|-
|46
|48950
|2600
|-
|47
|51550
|2600
|-
|48
|54150
|2800
|-
|49
|56950
|3000
|-
|50
|59950
|3200
|-
|51
|63150
|3600
|-
|52
|66750
|4200
|-
|53
|70950
|5000
|-
|54
|75950
|5800
|-
|55
|81750
|6600
|-
|56
|88350
|7600
|-
|57
|95950
|8600
|-
|58
|104550
|9600
|-
|59
|114150
|10800
|-
|60
|124950
|11600
|-
|61
|136550
|12800
|-
|62
|149350
|14000
|-
|63
|163350
|15200
|-
|64
|178550
|16400
|-
|65
|194950
|17600
|-
|66
|212550
|19000
|-
|67
|231550
|20400
|-
|68
|251950
|23200
|-
|69
|275150
|24800
|-
|70
|299950
|
|}


{{Guide}}