They really should add the special attacks from the
Dragon Battleaxe:
"The dragon battleaxe has a special attack, Rampage; when toggled, the player character immediately hefts the weapon above their head, consuming 100% of their special attack energy. This drains the player's Attack, Defence, Ranged, and Magic levels by 10%, while increasing their Strength level by [10 + (levels drained / 4)]. The strength boost is comparable to that of a super strength potion. However, depending on the player's combat levels and preexisting boosts, it can raise strength by up to +21.
This accounts for the popularity of this weapon; although it is seldom used in combat, it is entirely possible to use Rampage for a strength boost and then revert to a primary melee weapon. The drained stats can be recovered using a restore potion.
Alternatively, drinking from a fancy/ornate rejuvenation pool eliminates the hefty stat penalties and special energy cost of Rampage while retaining the strength boost."
Darklight:
"The Darklight has a special attack, Weaken, which consumes 50% of the player's special attack energy and lowers the opponent's Strength, Attack, and Defence levels by 5% (10% for demons) of their max level. This special is only activated when the player hits accurately and multiple special attacks will stack.[1] "