Video Summary - The Future of Combat Is Here... ft. @edimmuz

Overview

The old melee/magic/range systems were rebuilt so each style has a distinct, easier-to-learn identity.
The ability book was simplified: many abilities were repurposed or stripped down to reduce keybinds and make combat more fluid.
New UI tutorials explain abilities as you unlock them.
Combat skills (melee, ranged, magic) now scale to level 120 to match necromancy.
New combat animations and additional skillcape perks were added.

Basic attacks: every style now has a basic attack. For magic, your selected spell becomes the basic attack.
Thresholds → “Enhanced abilities”: formerly required 50% adrenaline are reworked and no longer need 50% to cast.
Ultimates: some ultimates now cost 60% adrenaline (example: Deadshot).
Food: heals the full amount of its tier and now only costs 3% adrenaline to eat (consistent full healing regardless of level).
Action bars: auto-set your ability bars by right-clicking the cog at the bottom-right of the ability bars.
New in-game tutorials explain abilities and combos when you unlock them.

New Blood Lust mechanic: using a fury-like ability generates Blood Lust stacks; max stacks empower certain melee abilities (e.g., extra damage, add extra Hurricane hit).

Note: subtitles in the source showed “fur”; this is almost certainly meant to be “fury.”
Dismember: now heals you for a percentage of damage dealt (provides early/mid-game sustain). Additional casts unlock as you level and apply extra DoT. Dismember no longer generates adrenaline.
Hurricane: cooldown reduced by 3 seconds per target hit when it strikes multiple targets.
Design intent: melee gains more sustain and decision-driven play — you choose which empowered ability to use for optimal damage and survival.

Basic attack example — Gailshot: applies a personal buff causing ranged hits to deal additional damage.
Ricochet: reworked so it hits up to three targets when present; if only a single target is present, all arrows hit that one target (very high single-target damage potential).
Rapid Fire: you can now move and shoot at the same time, making ranged a highly mobile DPS archetype.
Overall: ranged becomes easier for new players while remaining strong in mid-game play.

Your selected spell is your basic attack; this is especially relevant for ancient spells whose secondary effects (healing, stuns, etc.) will apply on the basic attack.
Sonic Wave: reduces the next ability’s adrenaline cost (subtitles mentioned early values around 10% and later up to 35% — use Sonic Wave immediately before costly spells to save adrenaline).
Chain: now deals 30% of the damage of your next ability to additional targets (improves multi-target weaving).
Runic Charge: empowers your next magic ability.
Other spell updates: Dragon Breath increases damage; Concentrated Blast grants more crit chance.
Design intent: magic is emphasized as combo-centric and strong/easy for new/mid-level players.

Auto-setup action bars: right-click the cog on the ability bars to quickly prepare for Slayer/tasks.
Use Sonic Wave (or similar cost-reducing effects) immediately before high-cost magic abilities to reduce adrenaline cost.
For ranged single-target fights, use Ricochet to concentrate all arrows on one enemy for huge mid-game damage.
Use Rapid Fire to maintain DPS while repositioning — ideal for mobile encounters.
Eat any tier of food when needed: it restores the full tier amount and only costs 3% adrenaline, making eating less punishing.
For melee, build and manage Blood Lust stacks to empower key abilities; use Dismember for sustain in early/mid game.
Consult the new in-game tutorials whenever you unlock an ability to learn optimal uses and combos.

Attack cape: +2% hit chance for melee.
Strength cape: Dismember, Slaughter, Massacre heal an additional 3% life points.
Magic cape: hex spells (including smoke cloud and vulnerability) last twice as long.
Ranged cape: 10% chance to save ammunition.

See the official RuneScape blog post (linked in the video’s pinned comment/description) for complete patch notes and detailed changes.