Btw

What Askin does can be simplified pretty easily. First part of his schrift ist thatby ingesting something (e.g. Blood or poison) he is able to change the lethal dosis of others. An example is when he lowers the lehal dosis of blood in oh-etsu's body by ingesting blood. This forces ohh-etsu to lose blood or he will die of overdose, but if he loses too much blood he will also die. The second abilty of his schrift is gaining immunity to substances or energy attacks(example is a spell) he comes in contact with. (In case of the spell he would then be immune to this spell, that means he takes no damage from it) Another thing to note is that he also heals from wounds that were made from things he is immune to. In his Vollständig this gets strenghened by allowing his immunity to instantly adapt to small changes in the things he has immunity. (An example here would probably be getting hit by a similar spell and instantly adapting to it ) I think Askin would be a really good counter against magic because of the first part, but you could also probably silently assasinate others by lowering the lethal dosis of their blood. Of course Askin also has some physical poison attacks with a pretty strong combination of Gift ball deluxeand Gift bereich when in Vollständig, using Gift bad (practically a better version of the first part of his schrift or Gift Ring (also used in Vollständig). I hope this helped understanding askin's abilities.