>>542366507
Living Cells are the currency for the Mizuki IS that builds up for the reward track, they don't have any effect on gameplay. The slime you talk about is probably Nethersea Brand. Stultifera Navis introduced it as a gameplay mechanic so the game assumes you know about it. You can only stop the spread by putting operators on it but most stages with it are preset already. Nethersea Predators, seaborn with a beak like head, are unblockable while they stand on it. Use crowd control on them to slow them down and remove their dodge.