A B C D
1
2 X X
3 X X
4
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If Kharas is at B4 and he need to be at B1, he just need to do B4->A3->A2->B1. That means 20'. I know you can't go in diagonal when it is the corner of a wall, as it occupied 100% of the square, but teh Clack, except if he looks like a big Cube, should occupied enough the square to hinder diagonal movement, only movement in his squares (like B4->B3->B2->B1), and that mean it would needed a DC:25 tumble roll...