How Stellactrum Matching Actually Changes Your Damage in Love and Deepspace
The exact percentages behind Stellactrum matching have never been translated to English before – this is the math the Chinese wiki has published since December 2024.
Every Memory Card carries one of six Stellactrum colors: Emerald, Ruby, Sapphire, Amber, Pearl, or Violet. Some battles list a Stellactrum requirement, and matching it is worth more than a vague bonus – each matched color point adds +5% damage dealt and -5% damage taken, and matching a battle's full requirement adds +100% damage against a Weakened enemy while breaking two shield layers in one hit instead of one. This exact percentage math comes from the Chinese-language wiki's combat basics page and, as far as we have found, has not appeared on any English-language source yet.
A Memory Card's Stellactrum color shows in the corner of its icon, independent of whether the card sits in a Solar or Lunar battle slot. It is the same color that decides which Ascension Crystal levels that card up – that part is already common knowledge across English guides. What is missing from those same guides is the combat math below: exactly how much matching is worth, not just that it is worth something.
According to the Chinese-language wiki's combat mechanics page, each individual Stellactrum color point your fielded team matches to a battle's requirement adds +5% damage dealt and -5% damage taken. Match the battle's full Stellactrum requirement, and the payoff jumps much higher: +100% damage against enemies in the Weakened state, plus breaking two Wanderer shield layers in a single hit instead of one. This is the only source we have found with exact percentages; it is dated December 2024, so treat these numbers as likely still accurate but worth re-checking if a newer patch changes them.
Alongside your Memory Cards, each Love Interest has a Battle Companion that fights automatically once unlocked – no separate leveling needed to bring it along. It attacks and uses its own passives, can block hits for you, and keeps its own hidden HP pool. That last part matters: if your Companion's hidden HP runs out, the battle ends in a loss even if your own HP bar still has health left. This detail comes from the same Chinese-language source as the matching math above.
A battle roster holds at minimum 1 Memory Card and at most 6 total: up to 2 in Solar slots and up to 4 in Lunar slots. Every one of those cards contributes its Stellactrum color toward the battle's match requirement, so a single off-color card in your six can be the difference between a partial match and the full +100% payoff.
Before a tough battle, check its listed Stellactrum requirement first – most players skip straight past this line. Then look at your six-card roster and count how many of your Stellactrum colors actually line up with it. Swapping in even one matching Memory Card you already own can flip a partial match into the full +100% Weakened bonus and double shield-break, without spending a single resource on leveling anything new.