Jeff Hoskins led the Warrior offense, matching his season-high with 19 points, while shooting 80 percent (8-for-10) from the floor.
Antonio Landers finished with 15 points in the victory and has now scored in double figures in six of the last seven games.
The first half was very tight seeing eight ties and 10 lead changes, while no team ever led by more than four points.
Landers hit a jumper to tie the score at 39-39 with just over a minute to play in the period, but back-to-back buckets by Ty Mason in the closing seconds gave the Golden Eagles a 43-39 advantage heading into halftime.
Jordan Hickman opened the second half with a jumper to trim the Warrior deficit to two, but 11 unanswered points by Cornerstone pushed its lead to 54-41.
Still trailing by 13 and 16 minutes remaining, the Warrior defense tightened up in holding the home team to just two field goals over the next 12 minutes, while the Indiana Tech offense poured in 20 points to close within 65-63.
Cornerstone (19-10, 13-8 WHAC) widened the gap to six at the 2:34 mark, but Hoskins responded with a big three to keep the Warriors in the game.
However, the Golden Eagles would go 9-for-9 at the charity stripe down the stretch to hold off Indiana Tech’s rally and secure the win.
The Warriors shot 49 percent for the game compared to Cornerstone’s 44 percent. The Golden Eagles had 11 more rebounds than Indiana Tech, which turned into 13 second chance points, but the Warriors converted 10 takeaways into 16 points.
The difference came at the free throw line where the home team went 20-for-27 and the Warriors just 12-for-18.
Hickman notched his second double-double of the season recording 11 points and 12 rebounds, while Melvin Brooks chipped in 13 points and four boards.
The fourth-place Warriors (21-8, 14-7 WHAC) wrap up their regular season on Saturday when they host conference leader Davenport University at 3 p.m.
The game holds major postseason implications for Indiana Tech, which can clinch a home tournament game with a win.