Three account perks

Arcane Tempo
Halves standard magic attack delay against NPCs, rounded up with a 2-tick minimum. PvP and special attacks are excluded.

Arcanist Focus
Increases magic damage dealt to NPCs by 5%.

Guardian Resolve
Reduces all damage received from NPCs by 5%.
Arcane Tempo reduces standard magic attack delay and Arcanist Focus adds 5% magic damage against NPCs. Neither removes rune costs, weapon charges or encounter mechanics.
Equipment upgrades to consider
Obsidian Life Spark
A successful weapon hit has a 20% chance to restore 1 Hitpoint.
Obsidian Spirit Siphon
A successful weapon hit has a 10% chance to restore 1 Prayer point.
Obsidian Aegis
Each non-zero NPC hit has a 1-in-12 chance to deal 25% less damage.
Bring your spell runes or charged weapon, magic gear, food and prayer supplies. Apply Life Spark or Spirit Siphon to compatible weapons; use Aegis on a compatible body or shield.
A useful swap
Replace Guardian Resolve with Vampiric Rhythm if you prefer a 10% chance to heal 1 Hitpoint on successful NPC hits rather than steadier damage reduction.

Before you spend
Check perk compatibility, compare permanent upgrades and review Forge materials. Socketed effects require worn matching gear; they cannot bypass the one-Tempo or one-Focus rules.