First of all, i'm wondering if these thorn talismanss are bugged or not: their description says that they "reflect physical and true damage and inflict heal block and permadeath" (and they would already be overpowered imho); but the problem is that they also remove beneficial effects on the enemy team...i'm losing a lot of arena battles cause of them.
Even when i have the endure buff on my characters, it's always wiped away and I get easily destroyed, since these thorn talismans also reflect waaaay too much damage.

So, beside the buffs removing, i think they should be nerfed a bit, as they are too OP at the moment in my opinion.