Banishing as a Wedge
Two or more casters can pool their power to cast any Banish spell at higher levels as a “wedge.” This requires the use of an appropriate banishment focus for the spell they intend to cast. All casters must be able to cast the same spell.
The lead caster, holding the focus, stands at the front of the wedge. All other casters gather behind them, making contact with them either directly or indirectly (i.e. touching the lead caster themselves, or touching casters who are touching the lead caster, etc.).
All casters including the lead may invest between 2 and 6 magic points each. Note that while conjunctional magicians can learn to cast these spells at greater efficiency, these abilities do not apply when wedge casting.
Once all casters are in the wedge, the lead caster activates the focus, with a short incantation (about the same as spell vocals), then leads all casters in reciting the destruction spell’s vocals in unison, ends with a relevant call at the target, including the combined level from all casters.