We need to Summon Four Altars around the map. Kill There’s Champions and get the offer.

First location: Ra Altar Room. From the bridge, turn left and interact the gong.

Second location: Danu Altar Room. From stairs, look on your left and interact the gong.

Third Location: Odin Altar Room. From the bridge, turn right and the gong is on the corner next to a window.

Fourth Location: Zeus Altar Tower. From the bridge, turn left and look on the corner.

Bring all four offer on the temple and place them on the spikes (feed the altar). Wait for a 15 secs or so and stone will transforms into a Pack A Punch.

Note: This can be done in any order.