Skladzien: Either You have another version either "video or it didn't happened".
Sorry but I'm guessing there's a bit of a language barrier? So I'm not certain I understand exactly what you mean. I presume by the sound of it you're calling something into question but since you haven't pointed it out while quoting the whole post it's hard to tell what exactly. I would guess you're referring to how easy that boss (Typhon) is, and how easily the Slayer character killed him?
Well since that character is now in Legendary Difficulty with different gear etc (I haven't played for a while so don't remember exactly how far along), I'm not sure how I would be able go back and do it again exactly as last time because in a way it's not the same character anymore and I don't remember which gear I used and what skills I've applied since then. I sometimes back up my saves but have no idea if I have any from round that point in time.
Even if I have backups from that point in time and could somehow find the right one I'm not sure I see the point as it's not really impressive. It's not hard to find videos of people killing bosses in Titan Quest including Typhon, and far more impressive ones of people making short work of the Hydra which is a far more worthy boss.
It's dirt easy to stomp over Typhon with a Slayer, should give it a go yourself if you haven't (and the Slayer was great fun especially if you like melee). Remember the Slayer has loads of buffs, some debuffs and a summons, and even more summons if you use a scroll. Once all those buffs/debuffs are up and you then get some triple hits with Volley (which is like 300% damage plus all the buffs against a debuffed target, a few lucky Volleys in a row does loads of damage and something like Typhon just melts away), meanwhile they're often busy attacking the summons/Battle Standard so except for AOE attacks you might not even get hit before something like Typhon goes down.
I don't remember how far along I am in Legendary now, though I haven't yet fought Typhon in Legendary I'm not expecting him to be any challenge at all presuming I get that far since I'm quite burnt out on TQ having gone through a bunch of time now with that Elementalist and Slayer.
edit,,,
Oh you also mentioned game version, I think it's v1.3 and there's nothing special about that as far as I know.