Oh right.

[@WildChocobo]

For being summoned in Staging Ground, the following benefits are accorded. 

-Rank-up to STR (D -> C).
-Rank-up to CON (D -> C).
-Acquisition of Personal Skill: 
[quote]Kaiju (Transfer Curse): E+++
In this world, curses cannot be broken. A curse that has already taken effect will never disappear, unless one possesses a rare trait on the level of demon exorcism...in other words, unless one can erase human destiny itself. The only functional way to release oneself from a curse, then, is to transfer it into something else.
This capability has been acquired by Berserker through synergy with the Noble Phantasm and the legend of his anger and madness entering the blades he forged. It is a talent analogous to a Sorcery Trait that allows Berserker to transfer a curse he has been inflicted with onto a sword of his making, which is then integrated into the sword as a consequence of the Noble Phantasm's nature. Were he inflicted with a curse that restricted healing, for instance, the curse could instead be transferred to the sword, making Berserker capable of healing his wounds and granting that sword the capability to inflict that same curse.
However, this can only occur during the forging process of a sword, and if the process is interrupted before completion, then the transfer will not take. Transferring a curse to an already completed sword cannot occur, as this skill is reliant upon simultaneous usage with the Noble Phantasm. Moreover, if the curse has a rank of A or higher on the standard scale, transference will be impossible.[/quote]