刀裹烈火：出手之前武器先烧起来

fx-fireblade

function CreateFireBladeSlash(pos, flip, intensity)
    local node = CreateEffectNode(pos)
    -- 刀气: 三层弧
    local arc = CreateArcBlade({
        layers = { {16, FIRE_DARK}, {10, FIRE_MID}, {5, FIRE_CORE} },
        sweep = 2.0, dur = 0.34
    })
    node:AddChild(arc)
    -- 弧面外缘火舌: 沿弧参数取点挂火苗
    for i = 0, 7 do
        local a = -0.9 + 2.0 * (i / 8)
        arc:OnProgress(function(p)
            local fa = -0.9 + 2.0 * p * (i / 8)
            local fx, fy = arc:PointOnArc(fa, 74)
            SpawnFlameParticle(node, fx, fy, 8, intensity)
        end)
    end
    if flip then node:setScaleX(-1) end
    return node
end

-- 命中帧: 迸溅火星
function OnFireBladeHit(target)
    for i = 1, 22 do
        local a = -math.pi / 2 + (math.random() - 0.5) * 2.4
        SpawnEmber(target:GetX(), target:GetY() - 40,
                   math.cos(a) * (60 + math.random() * 120),
                   math.sin(a) * (80 + math.random() * 120) - 40)
    end
    target:PlayHurtFlash()
end