Oooh! Cool! Gnurl wants that morning star for sure! (That is his weapon of choice, you know?) BTW, what does "slow burst" mean,anyway? Can Gnurl tell what the capacity of the morning star is? Is it one spell of any level, or only up to a 3rd level spell? Give me a second and I'll add a spellcraft check to this post.

Unfortunately, healing spells are Necromantics, and that's a prohibited school for Gnurl, so his spellcraft skill is "only" +17. Rats.
Gnurl's Spellcraft Check (Necromancy)=1d20+17= 37
1d20+17=37
Inappropriately Sized Weapons
A creature can’t make optimum use of a weapon that isn’t properly sized for it. A cumulative -2 penalty applies on attack rolls for each size category of difference between the size of its intended wielder and the size of its actual wielder. If the creature isn’t proficient with the weapon a -4 nonproficiency penalty also applies.
The measure of how much effort it takes to use a weapon (whether the weapon is designated as a light, one-handed, or two-handed weapon for a particular wielder) is altered by one step for each size category of difference between the wielder’s size and the size of the creature for which the weapon was designed. If a weapon’s designation would be changed to something other than light, one-handed, or two-handed by this alteration, the creature can’t wield the weapon at all.
This means that because the morning star is medium sized Gnurl will need to use it in two hands rather than one and that he will be at -2 to hit. Still might be worth it. It had Cause Serious Wounds in it when you encountered it as I'm sure H'Roosh can attest. It is now empty. Gnurl can refill it with any appropriate spell he knows based on the guidelines below. Enjoy!
SLOW BURST
Price: +5,000 gp
Property: Weapon
Caster Level: 5th
Aura: Faint; (DC 17) transmutation
Activation: —
This weapon has an image of a snail worked
into its hilt or grip, and it feels cold to the
touch.
A chill aura numbs this weapon’s victim
when you strike true. Whenever you score
a critical hit with this weapon, the target is
slowed (as the slow spell) for 3 rounds (Will
DC 14 negates). This effect activates even if
the creature struck is not normally subject
to extra damage from critical hits.
Prerequisites: Craft Magic Arms and
Armor, slow.
Cost to Create: 2,500 gp, 200 XP, 5 days.
Spell Storing
A spell storing weapon allows a spellcaster to store a single targeted spell of up to 3rd level in the weapon. (The spell must have a casting time of 1 standard action.) Any time the weapon strikes a creature and the creature takes damage from it, the weapon can immediately cast the spell on that creature as a free action if the wielder desires. (This special ability is an exception to the general rule that casting a spell from an item takes at least as long as casting that spell normally.) Once the spell has been cast from the weapon, a spellcaster can cast any other targeted spell of up to 3rd level into it. The weapon magically imparts to the wielder the name of the spell currently stored within it. A randomly rolled spell storing weapon has a 50% chance to have a spell stored in it already.
Strong evocation (plus aura of stored spell); CL 12th; Craft Magic Arms and Armor, creator must be a caster of at least 12th level; Price +1 bonus.