If you have a misconception that Dugu Bo really became divine, in 'Poison God' form then you are wrong.
I 'm clarifying that, based on Qian Renxue's many ideas, if all the poison stored in Soul power can spread throughout our the body while not mixing with blood, it will create a very terrifying effect on the user who will become practically untouchable. One touch might kill an Ultimate Douluo but cannot kill Tang Hao backed by Asura God.
And all the rings fused in one is the ring fusion technique. Unlike ring explosion used by Clear Sky Clan which supplies raw energy, the ring fusion technique does not supply raw energy but controllable energy. However the controller must have high mental strength to manage that.
It is not harmful to the body like ring explosion.
Dugu Bo named it 'Poison God' believing he had reached the top skill in poisoning and has become untouchable while in this form, because one touch of his is enough to poison anything.
This form duration is 30 secs at best and for this reason he clashed with Tang Hao from front.