The reason both Luciano and Blake had suggested that Tessie was the one to be saved was that they knew the capabilities of a blood harvester, especially against beasts.
Apart from the boost in plant control that came with advancing to a higher realm, a blood harvester unlocked 3 abilities that worked hand in hand.
The first was the blood drain. It granted the blood harvester ability to conjure thorny plants/vines that used the drained blood to strengthen themselves, thus saving the user quite a lot of mana.
The second ability was a passive one that granted conjured plants more energy during the daytime. Meaning a blood harvester was more dangerous during this time.
The last was the Mother seed and it allowed the user to conjure a seed that would give birth to a thorny tree.
The tree acted as a central processing unit that controlled the actions of every single plant vine under its control. This ability of the mother tree is very vital because it is impossible for a blood harvester to control every single plant vine of the Mother Tree on their own. All it needed was to know the will of the user and constant supply of a lot of mana, but that was till it upgraded to the second phase.
"Finally, it is fully charged." Creating a water wall in front of her, Tessie drank a mana potion before placing her hands on the mother tree.
The absorbed blood that had been stored in the other Tree's trunks began moving to all parts of the tree through the Vascular tissues, causing everything to grow.
The roots began increasing in both size and length, thus increasing the range of the mother Tree's effect. The plant vines that sprouted from the roots didn't only increase in size and strength, but the effectiveness of their blood-draining abilities was tripled.
As for the Mother Tree itself, it had grown from 4 meters tall to 6 meters in height and the thorns on its body had tripled in size. Its connection with the vines and roots had increased making it even more difficult for the beasts to dodge them talk more of escaping its binds.
Tessie wasn't done yet, clapping her palms together a wave of mana was sent through all the parts of Mother Tree, activating the active skill of the second phase.
Rain of thorns!
The thorns all over the Mother Tree began coming out like rockets that were about to be launched. Even at the top of the Mother Tree which was plain wood, thorns began appearing at every square inch except for the spot Tessier stood on.
Raising her hands, all the thorns began independently aiming towards different directions.
"Go!"
Once the command was given, hundreds of thorns 20 inches in length shot into the air, creating a literal rain of thorns on the beasts.
Swish! Swish! Swish! Swish!
All the beasts within the area of the thorn rain were impaled multiple times by the thorns. More than 90% of the beasts were killed leaving only a few that were fatally injured.
Due to the effects of the beast tide, those that were still able to move were still rushing towards Tessie even though they had multiple thorns still stuck in their bodies, but they were easily caught by the plant vines.
"There are still more?" Tessie was panting as she sat down on the Mother tree. She was had expended all her mana, but she wasn't worried even though more beasts were charging towards her from all sides.
This was because once the Mother Tree had been upgraded to its 2nd phase it became self-sufficient. It didn't need the user's mana to continue functioning, rather it began running on the blood drained by the improved blood drain vines. So with the piles of beast corpses and the number of beasts charging towards them, Tessie wasn't worried about the Mother Tree running out of blood.
Another reason why she wasn't worried was that she could see sparks of lightning and golden flames some distance away.
…
At the beginning of their charge through the army of beasts, they had found it very easy to move forward, but as they got closer their speed had reduced quite a lot.
This was because when a Tessie was sent outside the wall the attention of all the beasts had turned to her, therefore reducing the concentration of the beasts at the wall and increasing it as they got closer to her.
'Situation report.' Blake asked the system.
[Apart from the number of beasts, there is no beast to worry about.
As for Tessie, she is doing incredibly well…] As the system was giving a report, the sunny sky in front of them dimmed.
"Yup, she is doing very well." Blake couldn't help but admit when he saw the rain of thorns falling.
"Are you sure she still needs us to save her?" Brian chuckled.
"Don't like to ruin the mood, but this is an opportunity for us to push forward." Luciano reminded the team.
With the rain of thorns killing a lot of beasts, most of them outside the range of effect would surely charge at Tessie, meaning they would have lesser beasts to deal with.
…
On the wall, Major Reeves was watching the performance of every team and behind him was the 2nd year team that had one of their members sent back to the school.
They had lost not only because their selected teammate wasn't able to defend himself against the beasts, but the rescuing team was also overwhelmed because they were lacking in numbers.
"I never had hope for your team completing the exercise, but it seems some teams would be joining us to enjoy the view." Major Reeves said with a smirk as he raised his hands and Mana shockwave killed all the beasts around 2 defenders that had been overwhelmed.. Immediately 2 special ops units were deployed to bring the 2 teams back to the wall.