Eldritch Shadowrift is a forbidden spell hailing from the ancient times, dating back to the creation of the universe itself. Through its complex incantations and intricate ritualistic casting, a tear in reality can be ripped open, forming a portal into the depths of hell. This portal links both dimensions, allowing creatures to traverse through. However, the unstable nature of this spell brings forth dire consequences for those who dare cross the rift.

To cast Eldritch Shadowrift, the spellcaster must possess and utilize a Liminal Nexus Amulet throughout the ritual. This amulet acts as a channeling device for the immense power required to stabilize the spellcasting process. Failure to use the amulet will result in catastrophic consequences, wiping out all life within a ten-mile radius and potentially consuming the entire reality itself due to the extreme instability created.

When successfully cast, the Eldritch Shadowrift tears open a portal into hell, serving as a gateway for creatures from both dimensions. The portal stands for the duration of concentration, up to one minute. Each creature attempting to cross the rift must succeed on a Wisdom saving throw or face a consequence determined by the Dungeon Master.

Consequence Examples:

- Condemned Fate: The creature's soul becomes permanently tethered to the Abyss, rendering it susceptible to constant torment, vulnerability to infernal creatures, or being forever lost within the hellscape.

- Transcending Madness: The creature's mind is shattered upon crossing, plunging them into madness, resulting in the loss of rationality, memory, and personal identity.

- Consumed by Shadows: The creature is engulfed by the dark energies flowing through the rift, suffering immense necrotic damage or being turned into a corrupted husk under the influence of the abyssal forces.

As a 9th-level spell, Eldritch Shadowrift requires an experienced and powerful spellcaster to wield such immense arcane energy. The risks involved are great, demanding careful consideration before its usage.

Cooldown:

After the completion of casting Eldritch Shadowrift, a cooldown period of 1 week must be observed before the spell can be cast again. This duration allows the shattered reality to stabilize and prevents overuse of the forbidden spell, which could have disastrous consequences for all existence. It is crucial to respect the powerful forces at play and exercise caution when considering casting this spell.