Conclusion
With Lefiya unable to stop the demi spirit's chanting, suddenly, there was a big explosion as Welf used Will-o-Wisp to cause Ignis Fatuus. That stopped the chanting, while some minor damage also confused the demi spirit.
Ottar then jumped into action against the other large monster while Hogni carried Bell to Lefiya and Filvis.
Ottar, with a faint golden glow, looked positively dangerous in battle. As Filvis poured more potions on Bell, Lefiya started chanting another spell.
Ottar and Hogni were fighting the monster pretty evenly. Ottar's large blade was able to do some serious damage against the monster even while the monster also delivered serious damage to Ottar.
The magic-using demi spirit also starting chanting again, but Welf waited for the best time to cause another Ignis Fatuus. That explosion did some damage, but then the demi spirit looked at Welf realizing Welf was the cause of the spell failure. It then did a quick chant icicle edge attack against Welf who did not have the time to react. The ice severely damaged Welf.
With Welf knocked out, the demi spirit started chanting again. Suddenly a huge wind impacted on it...
Ais had finally recovered enough to fight, and launched an ariel attack. Seeing Ais fighting, Tiona, Tione, Gareth and Riveria also got up to help. Frustrated with their own weakness and unwilling to stay defeated, Bete and Allen also stood up to fight.
Tiona, Tione and Gareth went to assist Ais while Bete and Allen went to help Ottar and Hogni.
With the help of Tiona, Tione and Gareth, Ais was able to prevent the demi spirit from launching any serious magic. Every time they were knocked down, they got up again to keep fighting.
At the same time, the tide was turned with Ottar, Hogni, Allen and Bete ganging up on the other large monster. Ottar though realized he had a time limit on his enhanced level...
Lefiya then yelled "Get away now!" Lefiya then launched another Rea Laevateinn after her allies were able to get a sufficient distance from the monsters. The spell burned away the top human halves of the monsters as Lefiya fell down from mind zero.
While the 2 monsters were regenerating, Ais launched her Lil Rafaga at the magic using demi spirit, killing it. With the advantage, Ottar had the chance to get many deep slashes into the other monster, disabling it. Everyone then jumped in to finish off the monster, while Riveria checked on Bell and Lefiya.
It was a hard-earned victory. They now had to tend to the wounded and the dead...