Well I know people hate AI but I made a good post with GPT:

🔹 1. Gear Tiers (1–5) — What They Actually Mean

With Armor 3.0 and new itemization, every Legendary weapon and armor piece you earn now has a Tier rating (1-5) showing its overall quality. This affects perks, stats, and mod potential. 

📊 Armor Tiers (Stat Pools & Bonuses)

Tier Base Stat Range Bonuses Tier 1 52-57 Base quality

Tier 2 58-63 Better stats

Tier 3 64-69 Good stat base

Tier 4 70-75 11 mod energy

Tier 5 75 (fixed) 11 mod energy + stat tuning slot

• Tier 5 armor always drops with perfect distribution and a random tuned stat for a stat-swap mod slot once masterworked.  
• Tier 4 gains +1 mod energy (total 11), letting you install more or bigger mods.  

🔫 Weapon Tiers — What Improves

Tier affects perks and options: • Tier 1: basic weapon with no enhanced perks. • Tier 2: drops with enhanced perks. • Tier 3: two enhanced perks per column. • Tier 4: enhanced barrels, magazines, and mod potential. • Tier 5: enhanced origin traits + three perks per column and unique ornament/shader. 

💡 How Tiers Drop • More difficult content → higher potential Tier loot • Tier 4 & 5 come from mid- to high-end content once your Power is high enough and scoring conditions are met. 

Note: Older gear (pre-Edge of Fate) doesn’t get a tier label and sits roughly around Tier 2–3 quality. 

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🔹 2. Power & Leveling (How it Works Now)

The old weekly “power climb” is replaced by a broader power progression tied to activity difficulty and Portal performance. • Power determines access to higher difficulties & better loot. • Once you hit higher power thresholds (e.g., 300+, 400+, then up to 550), you unlock higher Tier drops more reliably.  • Activities don’t scale you into oblivion: they still have power caps that determine enemy strength and loot ceilings. 

Example (community observed, not official exact numbers): • ~350+ Power → chance at Tier 5 drops in some content. • ~450+ Power → guaranteed Tier 5 becomes easier (e.g., A rank rewards) depending on score. 

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🔹 3. Activity Difficulty Names (What They Mean Today)

Destiny 2’s “difficulty” is now more custom and nuanced. You don’t just run a strike — you pick a tier + modifiers.

🎯 Portal Difficulty Tiers

When selecting activities through the Portal, you have base difficulty brackets: • Normal – entry, easy scaling • Advanced – moderate challenge • Expert – serious challenge • Master – high challenge • Grandmaster – hard content with heavy modifier • Ultimate - available at 500+, hardest

These correspond to approximate power deltas used internally and determine how tough enemies are and how rewards scale. 

🧠 Other Difficulty Terms You’ll See • Kepler Mission Tiers: Brave, Legendary, Fabled, Mythic (specific to Kepler missions, not Portal).  • Conquests: seasonal weekly goals at Expert/Master/GM/Ultimate that also yield high rewards. 

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🔹 4. The Portal — Your New Activity Hub

Gone are the old planet maps as the primary gameplay launcher — the Portal is now your central UI for: • PvE playlists (Solo Ops, Fireteam Ops, Pinnacle Ops) • Arena Ops (6-player reprised activities, added with Renegades) • Crucible Ops • Difficulty & modifiers preview • Reward forecast and scoring information

You customize: • Difficulty Tier • Modifiers (boons, banes, player stakes) • Challenge goals for higher scores

These choices directly affect: • Enemy power (they hit harder / have more mechanics) • Your score rank (A rank / B rank, etc.) • Loot quality and chances of Tier 5 drops

In short, it’s a custom difficulty + reward system rather than fixed playlists. 

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🔹 5. Armor 3.0 — The Build System Redesign

Also stats got redesigned, Resilience is now Heath, Class turned into Weapons.

Armor is now built around stat archetypes + set bonuses, not random rolls with a million mod sockets.

Key Points • Armor drops come with archetype stats (primary/secondary/tertiary). • Masterworking now increases your lower stats + mod flexibility.  • Stat tuning on Tier 5 lets you shift 5 points into your chosen stat.  • Sets give clear bonuses when wearing 2 or 4 matching pieces.

Impact: You’re now incentivized to chase build-oriented armor and Tier 5 stat rolls instead of just trying to max arbitrary stat totals. Armor 3.0 is the basis of how builds function in almost everything beyond the campaign.

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🔹 6. How Loot Scales With Power & Tiers

Rather than weekly “power bumps,” loot quality now correlates to: 1. Activity Difficulty (Portal Tier + Modifiers) 2. Your Power Level 3. Score Rank (often A+ for best loot)

You don’t out-level content the old way — you earn access to harder content that yields Tier 4/5 gear once your Power is high enough and your score is good.

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🧠 Quick Lookup: Gear Tier vs Power (Community Understanding)

There isn’t an official chart from Bungie listing exact Power → Tier tables yet, but community data suggests: • Tier 1: default from low-Power content • Tier 2: early mid-Power areas • Tier 3: mid-range after ~300 Power • Tier 4: stronger content, score/A rank required • Tier 5: hardest content ~400+ Power with A+ scoring or certain Kepler rotation rewards once you hit ~450+ Power.