eth todesfaell flamme worth upgrading?

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Meph dropped me an ethereal todesfaell flamme (unique zweihander):

One-hand damage: 71-132
Two-hand damage: 109-206
Durability: 26 of 26
Req Dex: 84
Req Str: 116
Req Lvl: 46
+154% Enhanced Damage (120-160% range)
Adds 50-200 Fire Damage
10% Chance To Cast Level 6 Fire Ball On Attack
Level 10 Fire Wall (20 Charges)
Level 10 Enchant (45 Charges)
+10 Fire Absorb
Fire Resist +40%

Would this be worth using a pul to upgrade it to a colossus blade? I
think the result would be onehanded 99-266 & twohanded 232-461. If I
upgraded it, I'd give it to a barb merc, who wouldn't mind having some
fire absorb.