Is your feature request related to a problem? Please describe.

If a bo3 holds an entity it will always be the same entity. The only way to make this entity randomized is by making a custom structure with entities as weighted branches which is very inefficient and limits placement options.

Describe the solution you'd like

A similar method such as randomblock() that could look somewhat like:
RandomEntity(Entity,Number,Rarity,[AnotherEntity,number,rarity])