The best one to attack was the one that was chained, as it was clearly struggling to escape from the bonds that confined it, and it was best to get the beast, or tumor as Silas put it (and Keiko would have probably agreed if Silas had said this), while it was immobile. So with Energy Strike active, Silas lunged in for a Chain Attack to try and dispatch the beast before it could break free, the only way Silas could possibly miss at all being if he tripped over his face. 

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Silas Attack 1: Hit (Max Damage)

Damage Dealt: 63

Slash 2: Hit! (Max Damage)

Damage Dealt: 72

Slash 3: Hit! (Max Damage)

Damage Dealt: 81

Total Damage: 216
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All three slashes hit, the energy in the katana possibly being combined with the strike rather than an addon thanks to whatever Talisman that Keiko used on Silas, as Silas would feel without whatever power she used on him the energy would have been easily resisted by the creature, but because the energy damage was merged with the physical for the purpose of attacking this dark spirit then the damage was a bit stronger. Still, the thing was alive, and thrashing about more now, screeching cries of pain, hatred, rage, and despair, making Keiko's eyes visibly narrow in disgust as she had been chanting something beneath her breath after she had used those talismans on Silas, Eria, and Sasha. 

The one that was chained up looked rather weakened, having about 1/5th of its HP bar left, and judging from both damage amounts dealt, it was clear that the creature had around 500 HP. That meant that between the four of these creatures was 2,000 HP total, which was alot of HP. Of course, if Silas had used the Breathing Technique he could have probably finished the creature off there with that extra damage, but that was one problem with the Gamer power that Ren had thought about before (but never discussed), there were so many Skills that one could possess that it was hard to remember them all.

Katana Mastery and Chain Attack did Level Up then though after Silas' chain attack was finished, which was good.