tyranids vs chaos

Hi knowsaj here, this is my first battle report so im open to criticism. I was playing my tyranids and Nemesis his nurgle marines, also Nemesis took all the picture (all 73 of them I had to go through with most being blurry messes). warlord trait: Precepts of Deception (so worthless for my list really) my 1850 list HQ warlord hive tyrant w/ x2 twinlinked devourers psychic