I told you a while back you can damage him if you punch him,has
any one been able to kill him.
how ever reading another post before called 'xan and zombies'
i know you can only knock people out with fists. So he must
be unkillable

there is another very interesting thing about ulcaster:

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you must get him the statue from the archeological guy (same map as the mad nashkel soldier leader) and also get him the destroyed piece of armor from firewine bridge. ulcaster will give you a vampiric sword.... this one s pretty cool ;)