Actually Bane is very simple. What you need to do is just attack him with any range spell / attack you have and throw all those barrels of posion at him. The only time he really does damage is when the roof collapses and you can avoid all that damage completely by standing underneath the pipes on each side of the room.
I soloed him and got the achiev for not dying or using a health potion or supercharge ability that way. Try it out

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