Misericordia

It is likely there was some Difference between a Misericordia and an Amerciament. For Example : It was called an Amercement, after it was reduced to a certain Sum; and a Misericordia both before and afterwards.

Source: wiktionary

Neither do I see any reason why such an award of a misericordia by a judge of a court-leet, should express any certain sum for which the party should be in misericordia, except in such cases only where no other person is afterwards to affere it; for in other cases the award of a misericordia is only in order to authorise others to fix the sum which the party is to pay to the king for his default;

Source: wiktionary

In criticizing this Schedule we would first observe how Gervase Paynel of Dudley having compounded for his offences by a Fine of the former year, was not visited by a misericordia of later date.

Source: wiktionary

Near the armchair stood a table; on the table was a crucifix, near it a pitcher of water and a loaf of black bread; in the latter was thrust a misericordia, or that dreadful knife which knights used to despatch the wounded.

Source: wiktionary