Comments from our Elden Ring Wiki
By Anonymous
The caster holds up the item then slams it down between their legs, it creates a purple-like shockwave effect that emits forward out of the ground in a cone, the first one is only one set of large spikes, the next row is 2 spikes, 3 and so on until 5 or 6 rows are reached. It has very good range and arc and comes out fast making it viable in PvP to unsuspecting players
By Anonymous
It doesn't cost any stamina, so if you are low on it this item will definitely be useful at keeping some range between yourself and another player.