The unique skill "Heavy Attack" has been added to Halvan. Holders of this skill will add half the weight of the weapon to their Atk when they are unable to pursue (round off a fraction).
This effect was inspired by the fact that Halvan is seen as a power fighter compared to Oshin, and the skill that appeared in Engage. In many ways it is not a good idea to calculate the difference between a weapon weight and build, so the judgment is based on whether they can pursue or not.
It has no synergy with Halvan's other skill, the Pursuit Critical, they are completely exclusive. But it is useful to be able to boost Atk while they cannot pursue in the early stages, and if you want to take advantage of the Ambush skill, the heavier the blow is the better, so you might try to ignore the Pursuit Critical and focus on this one. The higher level weapons are heavier than the lower level ones, the later in the game you get the benefit of this skill, the greater. It might also be fun to give him a Garrison Shield.