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Sunken Spells & Depthcasting

Under some circumstances, it is possible that the Spell Point cost of a spell drops below 0. These rules in turn describe the circumstances that arise from there.

Sunken Spells: Sunken Spells are spells that have a Spell Point cost below 0.

Depth: Sunken Spell have a Depth equal to the number of Spell Points their cost is below 0 by.

Depthcasting: Depthcasting automatically happens when casting a Sunken Spell. When Depthcasting, the spell is upcast by a number of Spell Points equal to its Depth for free, bringing the casting cost back to 0.

Upcasting Sunken Spells: When you decide to upcast a Sunken Spell further, the casting cost is increased by the upcasting as usual, adding to the upcast facilitated through Depthcasting.

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Example

Through Trash Becomes Treasure, a level one Sorcerer has made their cantrips cost -2 Spell Points. This means that whenever they cast a cantrip, it is automatically upcast by 2 Spell Points through Depthcasting. For their Fire Bolt, this leads to no additional effect by itself, however, they can now upcast their Fire Bolt by 1 additional Spell Point to bring its casting cost to 1 Spell Point, being upcast by 3 Spell Points, increasing its damage from 1d10 to 2d10. Starting with level 5, Trash Becomes Treasure will reduce its cost by 3 instead, leading to this damage increase becoming automatic and free.