Implemented SevTech: Multiplex portal costs (Abyssalcraft)

Every time a player want's to light up a Abyssalcraft portal he/she has to give a key in exchange.
This key is used in a ritual to get the key for the next dimension, this key has to be given in exchange to light up that portal too and so forth.
Every time boss fights are nessessary before one can perform the key-ritual.
Can we please get back the corresponding key once we have lit the portal to the next higher dimension?
Thanks, Blox

 

The key has to be the unlock item, every other item is relatively easy to obtain.
But to get the last key, I now have to make four abyssal wasteland gateway keys, three Asorah's Dreaded Gateway keys, two other keys, only to get the last key that possibly is the item to unlock the last abyssal portal AND has to be used to kill abyssal mobs from this moment on further
The only item suggestion would be an item from the next higher tier of dimension, so player have to create thair own portal first and bring back the item to light up the multiplex portal

 

In order to progress in Abyssalcraft you have to upgrade your mod specific book (necronomicon) to the next higher tier
Wasteland portal unlock item: Abyssal wasteland neconomicon (tier2)
Dreadlands portal unlock item: Dreadlands necronomicon (tier3)
Omothol portal unlock item: Omothol neconomicon (tier4)
Player can only unlock the portal if they were in the corresponding tier dimension already
That‘s a less resource hungry solution than the key one
The Necronomicon is extremely easy to craft, but it can only be used by the first player to open it.
To upgrade the book to the next higher tier player only have to kill some basic mobs with the staff of rending, no rituals needed
The necronomicon has a charge system, it must be possible to unlock the portal with zero charge left on the book