After Mo Yuxin and Su Yubing finished experiencing the benefits of the strange energy, they were a little surprised at first but quickly found that the amount of energy they got even after killing 30 of these rank 2 'tail bone mermaids' were far from enough to actually give them even the least amount of benefits.
After all, their body Cultivation was not oy higher than their actual Cultivation but their bodies were also tempered to the extreme making this little bit of energy have little to no effect in their body.
But it did make them feel pretty refreshing as the cooling sensation of the energy flowing through their body made them both feel reinvigorated.