There are at least two bands called Nexion:
1. A Black metal band that formed in Reykjavík, Iceland in 2016. They released their debut EP Nexion in April 2017 and performed at Oration Festival MMXVII.
2. Occult Black/Death metal from Scotland. They released a self-titled EP in 2011. Their guitarist also plays in Lunar Mantra. Read more on Last.fm