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Proposed version:
Basically... switches eldritch blast to one melee touch attack that deals damage once and provokes attack of opportunity. Melee touch hideous blow. That's it. Oh, and it should spawn glaive and play hitting animation.Least; 2nd; Blast Shape
Your eldritch blast takes on physical substance, appearing
similar to a glaive. As a full-round action, you can make a
single melee touch attack as it wielding a reach weapon. If you
hit, your target is affected as if struck by your eldritch blast
(including any eldritch essence applied to the blast). Unlike
hideous blow (Complete Arcane 134), you cannot combine your
eldritch glaive with damage from a held weapon.
If someone wants multi-hit version, there's few ways about it:
1. Roll several melee touch attacks and still deal damage once if one of melee touch attacks hits.
2. Cap maximum number of hits (each dealing full EB damage) to, say, two, but still deal full eb damage.
3. Lock warlock in place for one round, but still deal multiple attacks.
I think that #1 multi-hit version would be appropriate as well.
Here's full original text ofr eldrtich glaive: