Wabash's Caleb Lyttle had tied the game at 48-48 with 6:11 left in regulation time, the contest's ninth deadlock, before Warnock sank a pair of free throws for a 50-48 Bishop lead with 5:30 to go.
Sophomore post Jesse Jean followed with a fast break lay-in for a 52-48 Bishop lead, and after Lyttle and senior guard Ross Rybarczyk traded buckets, Ohio Wesleyan held a 54-50 lead with 3:27 remaining.
Kyle Medeiros brought Wabash within 54-53 with a 3-pointer with 2:50 to play, but Rybarczyk answered in kind on Ohio Wesleyan's next possession, restoring the 4-point margin with 2:18 to play.
Medeiros scored to make it a 57-55 game with 2:08 remaining, and it appeared that momentum was swinging Wabash's way when Andrew Zimmer got a hand on a 3-point attempt by senior wing Bryan King and Wabash gained possession on the end line.
King came back to steal the ball from Medeiros, and after a turnover by sophomore post Dustin Rudegeair, King came up with another steal, giving the Bishops the ball back with :39 left in regulation time.
Rybarczyk hit a pair of free throws with :25 left for a 59-55 Ohio Wesleyan lead, and after a pair of Wabash misses and defensive rebounds by Rudegeair, Warnock iced the game with a pair of free throws with :01 on the clock.
Ohio Wesleyan had taken an early 7-2 lead, thanks in part to Rybarczyk's game-opening 3-pointer, and went on to a 14-8 edge only to see the Little Giants come back with 8 straight points for a 16-14 advantage. With Wabash trailing, 26-25, the Little Giants scored the last 7 points of the half, getting a basket and a free throw by Adonis Joseph, to take a 32-26 lead into the locker room.
Wabash still led, 37-31, less than 5 minutes into the second half before long-range bombs by King and sophomore post Ryan Rozak tied the game at 37-37 with 13:49 remaining, and a 3-pointer by King gave the Bishops a 40-37 lead.
The Little Giants came back for a 43-42 lead on Lyttle's free throw with 10:22 left, but Ohio Wesleyan came back with baskets by junior post Ben Chojnacki and freshman guard Tim Patten to take a 46-43 lead with 8:56 remaining. The Bishops would not trail again, but the margin would not be larger than 4 points until Warnock's free throws in the final second.
Warnock led the Bishops with 12 points, going 8-for-8 from the line. Rybarczyk added 10 points and led Ohio Wesleyan with 7 assists, while Rudegeair grabbed a team-high 7 rebounds.
Medeiros led Wabash with 16 points and Lyttle added 11 points and a team-high 4 assists. Ryan Stephens led the Little Giants with 7 rebounds.