This upgrade is to increase Perseus' tier to 1-4 (Upgrade bought here http://www.platinumhearts.net/t5378p300-the-tier-skill-upgrade-store).
The training for this upgrade happened as a part of th http://www.platinumhearts.net/t14204-operation-forest-restorationcleaning-the-filth
During this process he also re-awakened the following ability.
Complete Conversion is an ability that Perseus has always had, but is never willing to use. Until recently.
This power allows him to do one thing, and one thing only. It allows him to turn any sort of matter, whether it be living, dead, or non-living, into any pure element found on the periodic table. The amount of the object doesnt change, as it normally would when Perseus changes an object since in that case he fuses them into larger atoms, which then leads to large amounts of energy being released after the atoms become unstable. This ability is the true definition of alchemy, turning one material into another, though it requires little to no equivalent exchange.
Perseus refused to use this ability due to his last uses of it. He didint have a choice to do it. Over a century ago when he was still a russian secret, they made him use it on living subjects. The Russian army wanted to create a type of human warrior that was composed of different elements so that they could have a chance to fight in escalating wars. The process of converting living creatures into some sort of living metal seemed to be undersood, just replace all that carbon for the metal that was desired, keeping the structure of the body intact, but now resilient.
It did not go as planned.
The process was incredibly painful to the subjects, often taking hours, days, weeks, or even months for subjects to completely convert, and it rarely ended in actual death. The individuals survived the conversion, but were in intense pain and their cognitive abilities diminished to nothing more than what seemed to be mere children, looking only for an end to their misery.
Perseus watched them go through all of this, and he knew he was directly responsible for this. To many people this would cause them to just simply give up on their life, but he used a coping mechanism to shield himself from the severe depression and possible insanity that the events could bring to him. He compartmentalized. He coped by removing his emotions from the situation at hand, causing him to separate using complete conversion on living being and the memories that cause emotional turmoil from each other. By doing this he becomes emotionally "dead" when using the ability.
He can use the ability without any detriment when no living creatures are involved (he does not consider plants to be living thus can convert plants without any detriment). When he uses it on a living being then his emotions shut down for several posts ranging from 2 posts when used on basic hollows, to a maximum of 10 when used on humans. There are various factors that can affect the length of this effect as it is dependent on what reason they are being used. If he uses it on a human trying to commit a murder the length will be considerably shorter as opposed to if he is forced to use it on an innocent person.
When in this state Perseus' mental deduction increases as his mind is unimpeeded from looking at things from any angle he possibly can, but his focus drops as he is focusing on too many details at once, causing his reflexes to be delayed if he wasnt looking at a certain thing as it happens. His pain endurance is increased, as with no emotions fear leaves the building, but will power stagnates as self preservation leaves the building as well.