The first upgrade to the Weight Trap category, it has an upgrade cost of 3500 gold.
Going from the Ton Weight Trap (Rank C) to The Metal Ball Trap (Rank B) has the following effects :
- Increases the MP cost from 200 MP to 350 MP
- Success % increases from 4% to 5%
- Power increases from 25 seconds to 40 seconds
- Duration is not effected by the rank upgrade.