The needles that Sam released are actually the curse carriers. These are part of the contingencies he prepared for stronger opponents. He knew he doesn't have many resources in his hand even with the help of Grivon and the Gaja Clan.
He cannot hide if he makes too many things and he is definitely not particularly willing to shar that he can make liquid energy cells.
So, he decided to create curse carriers with fused attacks made by Grivon's subordinates. These needles are parts of the traps he created to deal with the league members.
Grivon might even know that Sam stored some away from the lot, but Sam didn't care. He decided to save some for himself so that he could save himself when he needed them and now he used four of them.
The blows of middle stage consummate cultivators of Astral plane are no a joke for the Initial stage Consummate cultivators of Astral Plane. They are dead as a rock as soon as the attacks land.
