Tiso

Tiso is an adventurer who seeks the Colosseum of Fools for the sake of challenge. He presumably fights using his shield, which he claims conceals a "deadly surprise."

He is arrogant, thinking of himself as an 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, the player never actually fights him, 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.

First Encounter, Dirtmouth
At the Forgotten Crossroads well Tiso can be found looking down into the well. He lightly hints at the Colosseum of Fools and expresses his urge to challenge the Knight.

Second Encounter, Forgotten Crossroads Stag Station
Tiso can be found sitting on the Bench in the Forgotten Crossroads Stag Station and expresses his dislike for the Stag Stations' convenience and that a real warrior goes somewhere without help.

Third Encounter, Blue Lake
Tiso is seen standing at the eastern shore of the Blue Lake, gazing over the water and expressing his dislike for peace and serenity.

Fourth Encounter, Colosseum of Fools
Tiso is found sitting on the bench below the Colosseum of Fools, looking at the ground as if waiting.

Final Encounter, Kingdom's Edge
Tiso's corpse is found lying on a ledge in Kingdom's Edge.

Trivia

 * Tiso is named after Tiso Spencer, the Kickstarter backer who designed him.
 * There is some evidence that Tiso may have been intended to be a Boss in the Colosseum of Fools at some point, but was scrapped later for unknown reasons, possibly because his creator only had paid for an NPC and not for a boss.

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