X4

Summary
An X mark is a terminology or grade given to an Astral Defender upon integration. The number four is actually given to the third iteration of the X marking, as the being(s) of origin X1 have either never been confirmed or may not even exist. As the third attempt of making an organised super soldier army, many preparations were made to mass produce the X4 soldiers. Much like the iterations before them, they were given the best technology that the human race could provide. Some time during their development and recruitment the Headquarters of the Astral Defenders was attacked by a mix of demons, humans and alien races. This attack lead to the destruction of the Headquarters. And the deaths of many soldiers due to lack of training.

After the events of the attack the X4 program was abandoned due to the technology and genetics required were destroyed. This then led to the development of the X5 program. No technology required for the production of X4's has even been found as almost all of it was destroyed during the attack, leaving less than 100 active X4 soldiers.

Development
The development of the X4 program started immediately after the creation of the X3's. They were designed and developed on the idea of being more cost effective than the X3's but retaining the same combat capabilities and survivability. Much like those that came before them the X4's were given multiple organs and enhancements to enhance combat capabilities, intelligence, psychological strength and survivability.