Regain is automatic TP regeneration.
Around level 55 to 60 give blm the ability to learn the spell regain. It should somewhat mimic the recast of refresh spell or haste.
If blm was given this spell around level 55 or so they would quickly become desired in standard xp party and tp burns. Though it would be a huge change for blm to need to deal with becoming a tp regen bot.. It is interesting to note that of the 3 main mage classes blm is the only one that doesnt have a buff to enhance melee or other mages like haste or refresh.
It would be interesting for blm to gain the ability to do a regain order and keep the melee in the party constantly regening tp.