Infection cores already work like that in SH. They still have the three different levels of infections like N-VH, the appearances just aren't as obvious. Level 2 infections glow a little, and level 3 infections have a unique appearance resembling a thorny mass. Level 2 infections have two effects at once, while level 3 infections have three. Seems they fire more projectiles as well, most level 3 infections I've seen fire three of the cannonball-like projectiles and two of the other projectile in quick succession (combined with health absorb, naturally).
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