The Warriors won the toss and chose to field first, a decision which looked like the wrong one at the halfway stage of the game.
Former West Indies Under-19 representative Tristan Coleman was in destructive form for the Titans with a rapid 23 off just 10 balls including three sixes.
Cameos from Oshane Walters (20), Wayne Davis (18) and Jamaica Scorpions all-rounder Jamie Merchant (16) helped the Titans post a formidable 106-6 off their 10 overs.
Mikheil Silver (3-11 off two overs) and Andre McCarthy (2-21 off two overs) were the best bowlers for the Warriors.
Cornwall then got contributions from all their batsmen to eventually overhaul the Titans' total on the very last ball of the match reaching 107-4 off 10 overs.
Ockeeno Farquharson (29), Andre McCarthy (23) and Kerry Holness (17) were the main contributors while Jamaica Scorpions batsman Paul Palmer Jr and Captain Damion Ebanks chipped in with 13 and 13 not out, respectively.
Merchant took 2-21 off his two overs for the Titans.
The Kings posted 102-6 off their 10 overs after the Warriors won the toss and chose to field.
Pacer Andre McCarthy was economical for the Warriors with 1-10 off his two overs.
The Warriors' reply never got out of first gear due to intelligent bowling from the Kings, eventually culminating with them reaching 79-2 after 10 overs.
Openers Ockeeno Farquharson (35) and Paul Palmer Jr (17) top-scored for the Warriors.
Shalome Parnell (1-13 from two overs) and Kenroy Williams (1-20 from two overs) were the wicket-takers for the Kings, which moved back to the top of the table with 13 points and secured a spot in the final with their sixth win in nine matches.
The Warriors are fourth on eight points after their fifth loss in nine matches.
The Royals chose to field after winning the toss and were dominant throughout the innings taking wickets in quick succession.
Jamaica Scorpions pacer Nicholson Gordon (3-13 from 1.2 overs), left-arm spinner Raewin Senior (2-9 from two overs, left-arm spinner Ryan Francis (2-6 from two overs) and off-spinner Peat Salmon (2-19 from two overs) were all instrumental in bowling out the Warriors for a subpar 58 in 9.2 overs.
Jamaica Scorpions all-rounder Derval Green (13), opener Ockeeno Farquharson (12) and former Scorpions skipper Paul Palmer Jr (11) were the only Warriors batsmen to scratch double figures.
The chase was a simple one for the Royals despite the early wickets of West Indies batsman Nkrumah Bonner (5) and Leroy Lugg (12).
Carlos Brown (25 not out) and captain Javelle Glen (16 not out) ensured that the Royals got to their target without the loss of another wicket, ending 59-2 from 8.2 overs to secure their fourth win of the tournament.
