im not sure im not using oth but check if rune charges appear if you do a rune x100 otherwise you can change the code by another one for example otserv 8.6Does Rune Charges show for anyone?
To me it is only saying:
20:20 You see an sudden death rune.
It weighs 1.20 oz.
It get used as it should and disappeared after it is out of charges.