You force an opponent into a disadvantageous position. This may represent a variety of actions: a feint, a diversion, or even a stinging remark.
Once you have described your approach, you perform a Check against your target, with a fixed Difficulty Level of 10 — the Game Master will determine the relevant Attributes based on your description.
Example: Princess Camilla has challenged the Death Knight Brandon to a duel. She circles the imposing warrior and attempts to put the light of the sun behind her, hoping to dazzle him — the Game Master calls for a DEX + INS Check.
For more information on status effects, see page 94.
Back to the example above: Camilla gets a critical success and decides to inflict slow on the Death Knight. She also generated an opportunity — which she immediately spends to send Brandon's sword flying from his hand.
You produce an item from your inventory and immediately use that item as part of the same action: you might give a potion to one of your allies or slip them a refreshing balm during a tense negotiation, for instance.
The rules for Inventory Points are explained on page 104.
Note that you can perform this action even if you have items equipped in both hands.