The rune spikeshield is a reward that can be purchased with 200 tokens from the Fist of Guthixminigame. It degrades with use like Barrows equipment. It can only be traded when completely uncharged. The Rune spikeshield also requires recharging once it has completely degraded, which will cost 20 Fist of Guthix Tokens in Reggie's shop.
The rune spikeshield is rarely used; its berserker counterpart is superior and only slightly more expensive in terms of tokens.