Fromund and Adam's Nexuses were similar. Their weapons did not immediately reveal their full power, and in order to reach the final stage, Fromund and Adam had to pay a certain price.
For Adam, the conditions were harsher. His Nexus put serious pressure on his body, which could easily cause critical damage. However, unlike Fromund, he could use his Nexus at any time if he was ready to face the consequences.
Fromund, on the other hand, had to wait. His spear worked the same way as Adam's rods. The longer he fought, the more energy, clashes, and injuries there were around him and his enemies, the hotter his spear became.
Each stage was represented by a new ring around his spear, and unlike Adam's Nexus with 5 rings, 3 rings were the limit for Fromund.
During their long mission, Fromund used two modes of his spear. Usually, that was the limit, because to activate the third ring, he had to be in a tough situation.