Lethalness

In St. James's Street there used to be several shops which would sell you any form of lethalness, from a rook-rifle to an elephant-gun, with the greatest urbanity.

Source: wiktionary

And a January 2020 Texas Department of Public Safety domestic terrorism threat assessment talked at length about incels, warning that “the violence demonstrated by Incels in the past decade, coupled with extremely violent online rhetoric, suggests this particular threat could soon match, or potentially eclipse, the level of lethalness demonstrated by other domestic terrorism types.”

Source: wiktionary