An ordinary blade will do you just fine. You'll want to stay clear of the mouth most of all -- even if you can shake off the poison breath, it's likely to take you right out of the fight. The tentacles aren't prone to grabbing, but they can easily crush bone if they land a hit, and they're much faster than they look for a creature that size.
If all that doesn't put you off, I'd be glad to have your blade at my side.
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If all that doesn't put you off, I'd be glad to have your blade at my side.