I think this is what you are looking for:
Using Wizardry Skills
To cast a spell, you must first delineate a ritual space by laying down a cloth, making a shape out of rope, or otherwise clearly marking out a small area with physical items, though these items do not need to be in-game crafted items. If you do not mark out a ritual space with items, you may still delineate a ritual area by spending one uninterrupted minute to physically mark out a space by pacing the length and breadth of a room, marking lines in the dirt, and so forth. You do not have to make any verbal comments or obvious gestures while pacing the area, but you cannot pace an area to mark it if another ritual space is active anywhere within the area you are pacing to mark. Using items to mark the ‘field’, or ritual area, is usually preferable because of its speed. A ritual space ‘field’ must be a minimum of approximately 2’ in diameter, with a maximum area of 10’ or one small room. Ritual fields cannot overlap. You cannot lay a ritual field over the edge of another active ritual field. If you lay out your ritual field over another inactive field, the inactive field area is negated. If you pace an area or room to mark a field, and leave line of sight of that ‘marked’ area, it becomes an inactive area and you must re-pace it in order to use it as a ritual space again.
Once you have delineated your field, you must set any ritual components you wish to use in the ritual upon the field, and open your Grimoire to the correct page for the spell you are casting. You must have the herbal component for the spell on your person or on your field. You spend the required time perform-ing the ritual actions described in your Grimoire for the spell, and as soon as you complete the ritual duration, call the appropriate effect verbal and spend the required stamina.
You must be in contact with your field the entire duration of the ritual, and your field may not overlap the field of another caster. If the ritual has a target character or item, that target must also be in contact with your field for the entire ritual duration. Your hands must be free to cast any ritual: you may not have your arms bound, and you may not be holding any items in your hands at any time during the ritual that are not part of the ritual as described in your Grimoire. You may not cast a ritual if both of your arms are rendered unusable (such as through the Maim effect), though you may cast if only one arm is useable. You may cancel the ritual at any time, and do not expend the stamina cost until the ritual is complete and has taken effect. If you are interrupted, whether by being struck by a weapon or packet, taking any item into your hands which is not part of your ritual, losing contact with your field, or your target losing contact with your field, the stamina and any components that would be consumed are not lost, but you must start the spell over again from the beginning. Your target may use any game skills during that ritual that do not require them leaving contact with your field or interrupting your concentration.
For the system information for casting all Wizardry spells, see Chapter 5: Wizardry.
Assume no malice.
Assume no altruism.