Link to final design:
https://tesrenewal.com/files/bat_axe_final_ca_dl.jpg
Lore-friendly pattern - thanks to lukkar:
http://i.imgur.com/exu2i3U.jpg
Next task for me is a redesign of the artifact weapon "Wings of the Batqueen" (better name for typing). It was a model you can find in Morrowinds CK, but it was never implemented in vanilla game.

I hadn´t found much lore about it, as it seems to be a outsorced item for Bethesda. But I mention it was a daedric gift for one of the shrine quests and might have something to do with Molag Bal and his vampires. Also the Winged Twilights could be involved, but as they are the servants of Azura, a cruel axe seems a bit out of range.
By studying the Molag Bal Designs in Skyrim and older games, they were always brute, spiky and demonic. For this axe I would like to implement some fantasy stuff, but also keep the descent realistic look of skywind. Here are some shapes:

We have a two-handed axe, size nearly to player (as in vanilla Skyrim). A (warpick) and B are my favs - C is mostly original, a silhouette of a flying bat fruit. D is a two handed mace, which is also an interesting idea imo. E and F are free for discussion.
I know that there is an earlier dead post for this weapon, but I created this new for a better overview.


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I think I like shape E the
I think I like shape E the most; I think it has more of a new look but keeps some of the originality of the first model! That's good thinking on the daedric involvement there, too.