Mata a Rovlen para conseguir el tentáculo, no siempre lo tira. 5 veces lo he tenido que matar. Debes esperar 30 minutos para usarlo.
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Kill Rovlen to get it, it has medium drop rate so try to kill some times if you dont get it at first time. I had to killed it 5 times.
You must wait 30 minutes to use it.