no invincibility just means no invincibility. though if you want to infer that as just a major durability buff that's up to you.
now, the boosts he gets during fury mode ain't invincibility. they're just pretty much a straight doubling to everything, attack range included. or his swift attack. DW guys aren't exactly 'guys with a spear' really seeing how they can run on water in some cases, and in others they.... can literally split a flood in two by spinning his weapon (this was Lu Bu). and figure you don't do a 10,000 on 1 unless you can deal with range and crap thrown at you.
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The future must protect the clone's past.
"Maybe it's a tentacle, molesting the planet itself. - Aschen Brodel.