I don't either, honestly. I've never understood why they're cross-classable. xD
But hey, Warrior gets the better end of the deal already. Provoke + Convalescence > Foresight + Bloodbath.
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Same reason CNJ can cross-class Physick.
Because reasons.
Fast Blade and Skull Sunder are there... .... ..............
....for melee DPS tanking.
(With GL3, DK, and Twin Skull Sunder can actually do quite a lot of threat.)
You can't cross class fast blade. You can cross class savage blade however, which is the same as skull sunder, the equivalent from marauder.
In the rush to fix the game and get it back out a few things were overlooked.
Savage Blade, Skull Sunder, Keen Flurry, there are a couple mage skills that were misplaced as well i believe.
The only difference is that PLD/GLA has a skill to regain some MP (Riot Blade), whereas neither class/job has a skill to regain TP.
(Invigoraaate ;_; y u not available to WAR?)
Edit: Plus, WAR/MRD only have enough MP to give them three or four Flashes ^^; Unless tank gear starts giving Pie due to DRK, Flash is pretty much only a backup while we regenerate TP :p