Safe thresholds, failure outcomes and A/S weapon stat gains per enchant.
Eligible weapons and ordinary armor are safe through +3; one-piece armor is safe through +4. No-grade items cannot be enchanted. Use the scroll matching the item's grade. Attempts beyond the safe threshold can fail.
A normal scroll failure destroys the item into crystals. A Blessed Scroll failure preserves the item but resets its enchantment to +0. A blessed scroll does not guarantee the next enchant level.
For each successful step from +0 through +3, A-grade weapons gain +4 P. Atk. for one-handed swords/blunts, daggers and spears; +5 for two-handed swords/blunts, dual swords and fists; +8 for bows. All gain +3 M. Atk. Each step reaching +4 or higher adds twice those amounts: +8, +10 or +16 P. Atk., and +6 M. Atk.
For each successful step from +0 through +3, S-grade weapons gain +5 P. Atk. for one-handed swords/blunts, daggers and spears; +6 for two-handed swords/blunts, dual swords and fists; +10 for bows. All gain +4 M. Atk. Each step reaching +4 or higher adds +10, +12 or +20 P. Atk., and +8 M. Atk. The increment doubles, not the weapon’s total attack.
Tallum Blade starts at 213 P. Atk. Applying the A-grade one-handed increments gives +0: 213, +1: 217, +2: 221, +3: 225, +4: 233 and +5: 241. These are calculated weapon stats before character buffs, not measured damage against a target.