NHF_0.85_data.pak\MapObjects\Inferno\NewHeroes\Vlastelin\Vlastelin.(AdvMapHeroShared).xdb
take a look here.
SPELL_BOSS_FIREWALL
and here are the settings: NHF_0.85_data.pak\GameMechanics\Spell\Hero_Abilities\BigBossFirewall.xdb
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