I like the idea. If a graboid is targeted, will it be able to turn
into a shrieker-weapon?
And how do you intend to target this Graboid?
what would devour do?
Look pretty.
This. Although it would be really cool for it to eat the opponent's weapon (tricky to code).
Possible compromise:
Weaponized Devour is coded as "DevourX", where X is the 1 less than the number of HP the original creature started with. DevourX kills any creature with X or fewer hit points, and increases the weapon's attack by 1.
Because weaponizing an Oty is an AWESOME counter to RoL/Hope/Lobo. HP growth is not required; weaponizing is already a big benefit because it dodges the Lobo bullet.