Blood of Yggdrasil

You bend the weave, tearing a small hole in the fabric of realms temporarily. When you cast this spell, a shimmering gate appears within 60ft of the caster, providing a view into another plane of existence. Creatures on the other side of this gate can come through at their discretion, and are not bound by the caster’s will in any way. However once through, they cannot move more than 120ft from the portal. Furthermore, no creature that was not summoned by this spell can use the gate, and interacts with it as if it were a pane of glass.

When you cast this spell, roll a d8. This determines the creature type/plane you tap into.

1: Abyss - Fiend

2: Far Realms - Aberration

3: Shadowfell - Undead

4: Material Plane - Monstrosity

5: Mechanus - Construct

6: Elemental Planes - Elemental

7: Feywild - Fey

8: Celestia - Celestial

The DM decides what creatures, and how many, appear through the gate. Creatures summoned by this spell may flee through the gate, but remain for 1d4 rounds after the spell ends before being transported back to their home plane.

If you maintain concentration on this spell for its full duration, the spell instead remains for 24 hours, corrupting and changing the landscape around it in the manner of the associated plane.