Planeshifting

PATCHED as of 2019-08-05.

This trick can only be performed on older versions of the game. It remains here for archival purposes.

Requirements

 * Any two warp rooms unlocked

How to perform

 * 1) Enter a warp room as normal and warp to another room
 * 2) Hold the up button after choosing the room
 * 3) During the animation you will hear the menu open (shortly after the animation for entering the portal completes)
 * 4) Once you hear the menu open, quickly navigate to any other warp portal and select it, this has a fairly small window.
 * 5) If done correctly, the animation for leaving the portal will be interrupted by an animation for entering the portal, you are now planeshifted.

Properties
While planeshifted, Miriam's model behaves strangely. Your terrain collisions and NPC interactions (including chests) will function as though you were in a normal state, but your enemy and spike collision will be offset based on the direction you are facing. Non-Miriam models like Bunnymorphosis have an increased distortion effect.

When facing left Miriam appears very large in the foreground, weapon attacks and certain shards will also be larger. While in the foreground Miriam will descend down and hit the floor in water areas.

When facing right, Miriam appears very small in the background, sometimes hidden behind background terrain. While facing right you will float in water as usual.

Certain effects and shards will still be based on Miriam's "true" location, like Welcome Company or Words of Wisdom. This can be used to help navigate while planeshifted.

The effect will end after certain animations or after reloading the game. Most notably, any weapon tech will end the effect.

Double planeshifting
You can stack the effect by performing the glitch again while already in the planeshifted state. This can be repeated any number of times to increase the offset of Miriam's hitboxes. After two stacks, there are some notable changes.
 * While facing left, Miriam's hitbox is entirely offscreen. You can no longer be hit like this, but damaging enemies can also be problematic (though there are a number of ways to do it).
 * You can no longer float in water regardless of which direction you face. Don't get stuck.

Applications
Double planeshifting for safe traversal of dangerous areas

Bypassing waterway progression blocks

Safety strats against certain bosses

Videos
Demonstration

Sinking in water

Hiding the hitbox offscreen

Going out of bounds (Interaction between this glitch and Dimension Shift is very strange)