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He is arrogant, thinking of himself as the ultimate warrior and showing nothing but contempt for the weak. He almost pays no notice to the Knight until later on, and even then he finds them beneath him.
Despite his bravado, he is never actually fought, as he dies off-screen in the Colosseum of Fools, his body later found dumped by the acid pits at the bottom of Kingdom's Edge with the other slain warriors.
After the Mothwing Cloak has been acquired, Tiso can be found next to the well in Dirtmouth. He lightly hints at the Colosseum of Fools and expresses his urge to challenge the Knight. Tiso never leaves a location until listened to.
Tiso is seen standing at the western shore of the Blue Lake, gazing over the water and expressing his dislike for peace and serenity.
Tiso is found sitting on the Bench in the warrior's pit of the Colosseum of Fools, looking at the ground as if waiting. He needs to be interacted with in the Colosseum and then a Trial must be either completed or failed for him to move from his spot on the Bench. After this, Tiso's corpse is found lying on a ledge in Kingdom's Edge.
Tiso makes a joke appearance with a fake out boss sequence in the Pantheon of Hallownest before being subsequently crushed by Brooding Mawlek. This will only occur if he has been listened to in the Colosseum.
If Tiso's body is Dream-Nailed, it will say: "...Why?...", the same as his real-world corpse.
Coincidentally, the Trial of the Fool has a Brooding Mawlek among its creatures, possibly implying that his cause of death was a Brooding Mawlek.
Before release, the shield that Tiso carries was going to be the shell of his fallen comrade. This is never mentioned in the final game.
According to his original concept art, he would throw his shield like the Marvel superhero Captain America, he also wears his hood to cover his horn shaped head.
His concept art also depicted him with a cloak, this isn't seen anywhere through the game.
↑Last Stag: "There's something unpleasant about that one, but a stag station's doors are open to all. If he requests passage, I'll offer it gladly. My duty as a stag far outweighs any personal distaste."
↑ 2.02.1Tiso: "I've heard an arena exists somewhere below. One built for our like. Meet me there and we'll test what skills you possess. I'll be heading down soon. Come and find me if you dare."
↑Tiso: "You think this shell a defensive arm? Well I'll give you fair warning, it conceals a deadly surprise. Pray you never find out what that is."
↑Tiso Dream Nail dialogue: "This little squib clearly fears me. I'd kill it right here, but it'd be too pitiful an end."
↑Tiso: "I'll crush them all. Oh, and you. You'll see me at my deadly best"
↑Tiso: "You use these old lines? Pathetic. A real warrior carries himself to combat. He has no need for such convenience."
↑Tiso: "What a calm place. It's action I want, vicious and deadly battle. This serenity is a bore."