Relics once acquired should need to be installed into a clan holding at which point for an enemy to remove them it should require a siege or some other special type of attack against the holding to remove. This helps mitigate a scenario where if a smaller or newer clan of players manage to obtain one the veterans of the game can abuse the system to just attack at an opportune time (when the newer clan is low population for example) to steal the relic with no opportunity to mount a defense. The existing system just feels a little unfun unless you're part of one of these large veteran clans.