[Ferous]

I use:

local _, class = UnitClass('player')
    if class == 'WARLOCK' then
        local shards = CreateFrame('Frame', nil, self)
        shards:SetPoint('TOPLEFT', oUF_SveltePlayer, 'BOTTOMLEFT', -2, -4)
        shards:SetSize(227, 2)
 
        for i = 1, SHARD_BAR_NUM_SHARDS do
            local shard = shards:CreateTexture(nil, 'OVERLAY')
            shard:SetSize((227 / SHARD_BAR_NUM_SHARDS) -1, 4)
            shard:SetTexture(bartex)
            shard:SetVertexColor(.86,.44, 1)
 
            if i > 1 then
                shard:SetPoint('LEFT', shards[i - 1], 'RIGHT', 1, 0)
            else
                shard:SetPoint('BOTTOMLEFT', shards, 'BOTTOMLEFT', 1, 0)
            end
 
            shards[i] = shard
        end
 
        self.SoulShards = shards
    end

Thanks to Evilpaul!!!