Mindblast, a branch of Mindforce and one of the Kai Disciplines, uses psychic stress to disrupt an enemy's concentration and battle prowess, granting its user bonus Combat Skill. Mindblast has no limit on its use, though it may not be effective against all enemies, particularly Undead. It can also occasionally be used outside combat.
From the Magnakai series and onwards, Mindblast is an optional, weaker, but safer form of Psi-Surge (Magnakai) and Kai-Surge (Grand Master and New Order Grand Master). These advanced skills provide larger Combat Skill bonuses, but drain Endurance points per round. Mindblast remains an option, but stronger enemies may be immune to it, forcing the player to use the Endurance-draining versions, or none at all.
- In the Kai series, it grants Lone Wolf +2 Combat Skill.
- In the Magnakai series, Mindblast continues to grant +2 Combat Skill, but Psi-Surge grants +4 Combat Skill, at the expense of 2 Endurance per round.
- If Lone Wolf reaches Archmaster, Mindblast will grant +3 Combat Skill, but Psi-Surge will grant +6 Combat Skill, at the expense of 1 Endurance per round.
- In the Grand Master and New Order Grand Master series, Mindblast grants +4 Combat Skill, and Kai-Surge will grant +8 Combat Skill, at the expense of 1 Endurance per round.
Mindblast is referenced a total of 19 times in the Kai series, of which 2 are outside combat.
| Book | Times | Outside combat |
| Flight from the Dark | 1 | 0 |
| Fire on the Water | 5 | 1 |
| The Caverns of Kalte | 5 | 1 |
| The Chasm of Doom | 2 | 0 |
| Shadow on the Sand | 6 | 0 |