Since the warlock can also wield two-handed weapons in one hand, for warlocks Obsession is likely to be the better choice in most cases. The rune costs are similar but Obsession provides more +skills and more fcr as well as fhr, increased maximum life and high all res.
Perfect Void outperforms Heart of the Oak in terms of pure damage by about 10 % for hammerdin's Blessed Hammer purposes. This comes at a cost of 30-40 allres, +20 life replenish and +10 dex when wielding Void. Void also offers 30% MF.
I suppose that this should be made in a non-Eth weapon to be able to recharge the Decrepify charges
And also, the +1 to Abyss should grant this skill to all character classes just like Passion grants Zeal and Berserk. Not sure if the skill would be of any use at that level though?
As Atari points out, Obsession is a better choice for a Warlock and Void may find better use on other classes, like the Hammerdin as mentioned by Sintory
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