When you expend a spell slot to cast a teleportation spell of any kind that names a passenger limit, you may immediately spend another spell slot of the same or a higher level to double this limit. For example, if you cast a 4th level Dimension Door, you can immediately expend another 4th level spell slot to take two passengers instead of one. This does not apply to spells where the caster is the only passenger, such as Misty Step.
You may do this once per long rest.
By extending three spell slots of the appropriate level, you may triple the passenger limit, and by expending four spell slots, etcetera.
You may not exchange spell slots of a lower level to meet this requirement, such as burning four 1st level slots to expand a 4th level teleportation. You can exchange a spell slot of a higher level, such as burning a 5th level slot for a 4th level spell.
A willing creature transported with this spell may expend a spell slot themself to meet this requirement, so long as they have one available, even if they do not know the cast spell themself. This does not cost an action or reaction to do.
If you wish to steal the spell slot of an unwilling creature to expand your spell, you shall both make contested Int/Cha/Wis saving throw, each appropriate to your own class. Should they fail the saving throw, they will be transported with you, along with any other creatures you wished to take with you, as appropriate (if other saving throws are required by any transported creatures, they shall make them as normal). Should you fail this throw, you will not be able to steal their spell slot, or expand the spell. You may not choose after this to expend your own spell slot, or that of an ally.
Stealing someone else's spell slot is a risk; the DM will not inform you whether or not the NPC or Monster you are targeting has an appropriate spell slot available.
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