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are set in the recesses of the pit
"The pit" refers to the grave; because the grave was thought to be the entrance to the world of the dead, the pit also represents that world. See how you translated this in Ezekiel 32:18. (See: rc://en/ta/man/translate/figs-metonymy)
all of those who were killed, who fell by the sword
This can be put in active form. AT: "all those whom enemies killed in battle" (See: rc://en/ta/man/translate/figs-activepassive and rc://en/ta/man/translate/figs-metonymy)
fell by the sword
The word "fell" here is a euphemism for "died." (See: rc://en/ta/man/translate/figs-euphemism)
those who brought terror on the land of the living
The abstract noun "terror" can be stated as "afraid." AT: "those who, when they were still alive, caused people to be extremely afraid" (See: rc://en/ta/man/translate/figs-abstractnouns)
the land of the living
This represents the people who were alive. (See: rc://en/ta/man/translate/figs-metonymy)