These 3 heroes are the best combo (among those given) for the team to kill Roshan at level 1:
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Syllabear
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Venomancer
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Drow Ranger
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Lich
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Sand King
-
Ursa
A,B,D
Correct answer
Explanation
The Syllabear (Lone Druid), Venomancer, and Lich combination was indeed one of the most effective level-1 Roshan killing strategies in DotA Allstars. Syllabear's Spirit Bear could tank Roshan's damage effectively, Venomancer's poison wards provided sustained damage output, and Lich's Frost Blast dealt area damage while slowing Roshan. This combo utilized each hero's level 1 strengths optimally for the unconventional Roshan attempt.