Upgrade

Upgrading (sometimes referred to as "Fusion") allows you to level up your cards. This is essential to maximizing the potential of your unit. During fusion, you can select up to 10 material cards in addition to Arcanas. There is also a chance of a Great Success from occurring, which doubles the amount of experience given. You can guarantee the occurrence of a Great Success by using Arcana's Blessing and even combine it with Arcana Training for a total bonus of quadruple experience.

Providing Experience
The experience given from various sources are as follows: Among all, Lvl27 Slime is the most commonly used card in upgrading other cards.
 * N-card: Lvl1 gives 100 exp, Lvl30 gives 2277 exp
 * HN-card: Lvl1 gives 150 exp, Lvl40 gives 7112 exp
 * R-card: Lvl1 gives 200 exp, Lvl40 gives 9477 exp
 * SR-card: Lvl1 gives 4000 exp, Lvl50 gives MAX exp
 * N Gold Girl: Lvl1 gives 200 exp, Lvl30 gives 2388 exp
 * N Slime: Lvl1 gives 1000 exp, Lvl27 gives 9601 exp, Lvl30 gives 11952 exp, see Slime Experience for a full list
 * R Metal Slime: Lvl1 gives 3000 exp
 * Lvl200 R Archwitch gives 600 exp
 * Lvl200 SR Archwitch gives 1200 exp
 * Lvl250 SR Archwitch gives 1500 exp
 * Lvl300 SR Fantasy Archwitch gives 1800 exp
 * Lvl300 UR Fantasy Archwitch gives 3000 exp

Upgrading Strategy
There are several methods to quickly raise a card to its maximum level. This section lists the various materials you can use in order to do so. Note that each listed point is an option to pick from, rather than being part of a multi-step process.

Level Slime From 1 to 27 (total 6868 exp): Level a Card from 1 to 40 (total 18564 exp): Level a Card from 1 to 50 (total 37900 exp): Level a Card from 1 to 60 (total 75936 exp): Level a Card from 1 to 70 (total 150760 exp): Level a Card from 1 to 80 (total 297950 exp):
 * 69x [Lv1 N Card] or;
 * 18x [Lv1 N Card] + [Arcana's Blessing] + [Arcana Training] or;
 * 2x [Lv1 Slime] + [Arcana's Blessing] + [Arcana Training] or;
 * 1x [Lv1 Slime] + 8x [Lv1 N card] + [Arcana's blessing] + [Arcana Training]
 * 1x [Lv27 Slime] + [Arcana's Blessing] or [Arcana Training]
 * 1x [Lv27 Slime] + [Arcana's Blessing] + [Arcana Training]
 * 2x [Lv27 Slime] + [Arcana's Blessing] + [Arcana Training] or;
 * 1x [Lv50 HR Card] + [Arcana's Blessing] + [Arcana Training]
 * 4x [Lv27 Slime] + [Arcana's Blessing] + [Arcana Training] or;
 * 2x [Lv50 HR Card] + [Arcana's Blessing] + [Arcana Training] or;
 * 1x [Lv40 Metal Slime] + [Arcana's Blessing] + [Arcana Training]
 * 8x [Lv27 Slime] + [Arcana's Blessing] + [Arcana Training] or;
 * 7x [Lv30 Slime] + [Arcana's Blessing] + [Arcana Training] or;
 * 3x [Lv50 HR Card] + [Arcana's Blessing] + [Arcana Training] or;
 * 1x [Lv40 Metal Slime] + 1x [Lv27 Slime] + [Arcana's Blessing] + [Arcana Training]

''Tip: In the settings screen, you can disable R cards and higher from displaying as materials. This can prevent the accidental loss of those cards.''