i was thinking having the big sword and do d style, but without the dash people couldnt do dstyle, maygbe they can extend the dash length to make it seem like tumbling
but goblin king smash is like a must if it can be implemented, that thing should do massive damage and cannot be blocked, just a bit slow
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its regarding to second reply, by adding length to big sword dash might make it really fun and op, in a sense people can time the dash length to for a cancel, so people can cancel mid dash or 75% of the dash, this is why i think tumbling seems more balanced ,
actually don't slow it, im playing with big sword right now,i think just by adding the length is good
the whole style can be very unpredictable, since people can cancel during the 1.5x dash length,
it might also need some invisible frame from jump massive, plus inbetween slashes, because that thing is really slow
maybe the most quick way to do it is by having regular massive animation from big sword but unblockable as alternative fire, if it's too hard to transfer some of the quest boss mechanics to players scripts then having a regular massive as alternative fire is good too, because it's big, so smash and unblockable makes more sense