Grandline Shinsekai: Episode 20

Vearth Weapons is the twentieth episode of Grandline Shinsekai.

Plot
At the site of the false summit, Romeo and Silvia are confronted by the butterfly-humanoid creature named Beelzebub. Romeo trades blows with the demon, and the ladder quickly realizes his is outmatched in a game of strength. Using an explosion as cover, Beelzebub transforms himself into a clone of Silvia. After several questions, Romeo is able to deduce him as the fake Silvia and freezes him.

Meanwhile, Harun and Shar duel with Macbeth at the noble summit. Their initial attacks are easily dealt with by Macbeth's "vearth weapon" the Necromancer. But to the pirates shock, the guards reveal vearth weapons of their own. Harun's dual rope darts and Shar's armor are capable of generating electricity. With their combined efforts, they are able to overwhelm Macbeth, but fall short of capturing him. Macbeth makes use of the collapsing surroundings to escape.