But HUO YUHAO used his intelligent mind and humble attitude to gets the original version of Tang sect's mysterious heavenly Technique method which was practiced by Tang san from the age of 3 years instead of 6 years after martial soul awakening, as he don't want to awaken spirit eyes with level 1 spirit power, martial soul as he most probably will going to awaken in this life also.
Regarding knowledge of spear, sword, and other intents which develop fully in DD3 time period he chooses to practice spear arts as for future practices as he will focus on inheriting sea god position as a spear with trident Ψ shape douluo world comprises of two-third by sea covered area. For the mysterious heaven technique, he modified it to two versions as 1) Mysterious Earth Technique and 2) Mysterious Heaven Technique. The question is why he produce two versions of the technique because unlike Mr. petty tang san who didn't share his clan techniques with xiao wu who was his only friend and supporter and stick to him like a leech all day, keep calling brother san brother san and never got her throat dry by repeating the same word, he is more impressed with the attitude of Tang sect by making cultivation method of mysterious heaven technique public but other secondary skills of jade hand, purple eyes and ghost perplexing shadow steps are only available to only those who join Tang sect. As these secondary skills are equivalent to self-made skills in other words, spirit skills without spirit rings so who say no to those free skills by joining Tang sect as clan and reputed families rarely share their secret technique If they have any to outsider who even attaches to their family clan as fear of leakage of skill methods outside the family clan. Same strategy he can use to attract civilian soul masters towards spirit hall.
The perk of both techniques is that they can be adopted by any soul masters without any backlash side effects below level 70 or before acquisition of the seventh ring where assimilation of martial soul with body happens, regarding the difference between earth and heavenly technique. Earth technique is almost similar to Mysterious heaven technique modified by Tang san according to need of spirit masters in this douluo world, which HUO YUHAO gets from Tang sect in DD2 and this technique planned to be published for general population. While heavenly technique is his greatest modification as:
1. It has slow purification effects to self cleaning of evil attribute [not dark or shadow attribute] so peoples like containing evil fire or ice or any other attribute with contamination of evil aura particles so peoples who has natural evilness in their martial soul can be cleansed [speed of cleaning increases if soul master suppressed his level and exercised which increases spiritual power like purple eye further increases rate of cleansing], joining evil soul master organizations and cults are not there only options they can comes to spirit hall. Only this merit alone save millions of peoples and infants to be killed by evil soul masters and spirit hall as a savior for those evil mutated or naturally awakened evil soul masters.
2. It will further modified the negative mutation which slows the cultivation or obstruct the cultivation path like in case master XU of blue tyrant clan the so called number 1 theorist as he himself never break through to titled douluo towards beneficial one by changing the course of mutation or completing the incomplete failed mutation. In addition if father of rong rong, the clan leader of seven treasure pagoda, sacrificed his seventh ring he may purified his seven level pagoda to eight and than nine level pagoda without any heavenly herb. [he can first use children of branch families as lab rat to confirm cleansing and evolution effects before sitting fully in the lap of spirit hall]
3. Originally by Using purple eye technique purple qi which can be absorbed only by eyes and which only appeared for brief period in early morning every day, WITH heavenly version blue qi absorbed and stored through whole body which slowly assimilate with spiritual sea slowly in remaining day which result in rapid increase in purple eyes stages and increase in spiritual power compared to what Tang san originally cultivate.
4. Like in beginning of DD2 under his teacher lan shoazle pressure he was improving his physical endurance by running in circle mysterious heaven technique involuntary circulates which results in his increase physical endurance this component also associated in his modified version which result in automatic circulation and cultivation in body itself result in one tenth of heavenly energy compared to cultivation under meditation, kept absorbing by body from atmosphere and continues increase in physical attribute of body during walking sleeping and other activities until the body reaches to the maximum what this world offers without becoming god that's is level 99.