A bacule is a portcullis or gate made like a pitfall, with a counterpoise and supported by two large stakes.

Not balanced; not in equipoise; having no counterpoise, or having insufficient counterpoise., Not adjusted; not settled; not brought to an equality of debt and credit; as, an unbalanced account; unbalanced books., Being, or being thrown, out of equilibrium; hence, disordered or deranged in sense; unsteady; unsound; as, an unbalanced mind.

calm, calmness, composure, cool, coolness, counterbalance, counterpoise, equanimity, equipoise, poise, polish, rest, serenity, stability, stasis, steadiness, steadying, symmetry

a state of equilibrium or equipoise; equal distribution ofweight, amount, etc.

something used to produce equilibrium; counterpoise.

mental steadiness or emotional stability; habit of calm behavior, judgment, etc

There are lots of different words for neutralise. The ones for the meaning: counteract

are:abrogate, annul, balance, cancel, compensate for, conquer, counterbalance, countercheck, counterpoise, countervail, defeat, frustrate, invalidate, negate, nullify, offset, overcome, override, overrule, redress, subdue and undo.