JUMPING

Standard Jumping Rules:

https://roll20.net/compendium/dnd5e/Movement#content

Long Jump. 
Tyrants and Oni add their current height to the jump distance.

High Jump.

For all creatures with a Size Aspect, basic high jump distance is Half Height + Strength Modifier, instead of 3 + Strength Modifier. Taller creatures can jump higher, small/strong creatures can be very bouncy.

You can extend your arms half your height above yourself during the jump. Thus, you can reach above you a distance equal to the height of the jump plus 1½ times your height.