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Thanks to @wade4423 I have managed to develop a better method to forging hammers. The following method uses Corruption Boon instead of draining boon, and can be used to get a hammer strong enough one-shot T7 rock.
For this method we will be using the following deck:

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We will be aiming for AoE 4, Damage 10, and either Heavy Duty (durability) or Busy Bee (faster speed) depending on preference.
Round 1: - Effect Gum
Round 2: - Effect Gum
Round 3: – Corruption Boon I
- If you get no boons first try, or If you get a boon that isn’t Devastating Damage, use Deconstruction Resin III and try again
Round 4: - Vigor Catalyst II
Round 5: - Special Gum
Round 6: - Special Gum
Round 7: Corruption Boon I
- If you get no boons, repeat round 7
- If you get a boon that isn’t Flanker’s Force / Low Blow / Cross Purposes / All-rounder / Random Acts (hereafter referred to as “AoE Boon”), goto round 8
- If you get a boon that is AoE Boon, skip to round 9
Round 8: - Boon Transmute Solvent
If you get a boon that isn’t AoE Boon, use Deconstruction Resin III and try again
Round 9: - Vigor Catalyst II
Round 10: - Longevity or Lightness Gum
Round 11: - Longevity or Lightness Gum
Round 12: - Corruption Boon I
- If you get no boons, repeat round 12
- If you get a boon that isn’t Heavy-duty or Busy Bee(unlikely), use Boon Transmute Solvent
Round 13: - Vigor Catalyst II
Round 16: - Effect Gum
Round 17: - Effect Gum
Round 18: - Protection Paste
Round 19: - Protection Paste
Round 20: - Fate Paste
Round 21: - Fate Paste
At this point, you should have an AoE boon of a random level, Devastating Damage, and (hopefully) Heavy-duty boon. If you don’t have Heavy-duty boon, than don’t worry.
The aim now is to develop Devastating Damage to higher levels without over leveling AoE.
From this point, you should keep using Corrupted Boon I until Devastating Damage reaches level 10 (or 8 if you only want to 1-shot tier 6 worlds). Than use Vigor Catalyst to receive a bunch of spent vigor back.
After this, use two Special Gums, one Protection Paste, than one Fate Paste, and keep using Corrupted Boon I to level up AoE Boon to 4. Than use Vigor Catalyst to receive a bunch of spent vigor back.
After this, use two Longevity or Lightness Gum (depending on which 3rd boon you picked), one Protection Paste, than one Fate Paste, and keep using Corrupted Boon I until out of vigor or stability.
If at any time the AoE Boon is close to leveling up to level 5, simply use Setting Resin.